forked from MidnightCommander/mc
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathconfigure.ac
681 lines (562 loc) · 17.5 KB
/
configure.ac
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
dnl
dnl Configure.in file for the Midnight Commander
dnl
AC_PREREQ(2.60)
AC_INIT([GNU Midnight Commander], [], [[email protected]])
m4_pattern_forbid(MC_)
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_AUX_DIR(config)
AC_CONFIG_SRCDIR(src/main.c)
AC_CONFIG_HEADERS(config.h)
mc_VERSION
AM_INIT_AUTOMAKE(mc, ${VERSION} )
dnl Enable silent rules by default (if yes)
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
AM_MAINTAINER_MODE
AC_CANONICAL_HOST
AC_USE_SYSTEM_EXTENSIONS
dnl ############################################################################
dnl Check for compiler
dnl ############################################################################
AC_PROG_CC_STDC
AM_PROG_CC_C_O
mc_CHECK_CFLAGS
CFLAGS_OPTS=""
if test "x$CFLAGS" = "x"; then
CFLAGS_OPTS=" -O2 "
fi
if test x$USE_MAINTAINER_MODE = xyes; then
CFLAGS_OPTS="-g3 -O -ggdb"
AC_DEFINE(USE_MAINTAINER_MODE, 1, [Use maintainer mode])
fi
AC_ARG_ENABLE([werror],
AS_HELP_STRING([--enable-werror], [Handle all compiler warnings as errors]))
if test "x$enable_werror" = xyes; then
mc_CHECK_ONE_CFLAG([-Werror])
fi
AC_PROG_LIBTOOL
dnl ############################################################################
dnl Check for programs
dnl ############################################################################
PKG_PROG_PKG_CONFIG
AC_PROG_INSTALL
AC_PROG_LN_S
AC_PATH_PROG([PERL], [perl], [/usr/bin/perl])
AC_PATH_PROG([PYTHON], [python], [/usr/bin/python])
AC_PATH_PROG([RUBY], [ruby], [/usr/bin/ruby])
dnl Check nroff and the options it supports
AC_CHECK_PROG(HAVE_nroff, nroff, true, false)
dnl Default values
MANDOC=-man
MAN_FLAGS=
if $HAVE_nroff; then
AC_MSG_CHECKING([for manual formatting macros])
AC_CACHE_VAL(mc_cv_mandoc, [
nroff -mandoc < /dev/null > /dev/null 2>&1
if test $? = 0; then
mc_cv_mandoc=-mandoc
else
mc_cv_mandoc=-man
fi
])
MANDOC=$mc_cv_mandoc
AC_MSG_RESULT([$MANDOC])
AC_MSG_CHECKING([for option to disable ANSI color in manuals])
AC_CACHE_VAL(mc_cv_man_nocolor, [
nroff -c < /dev/null > /dev/null 2>&1
if test $? = 0; then
mc_cv_man_nocolor=-c
else
mc_cv_man_nocolor=
fi
])
MAN_FLAGS=$mc_cv_man_nocolor
AC_MSG_RESULT([${MAN_NOCOLOR-none}])
AC_MSG_CHECKING([if nroff accepts -Tlatin1 or -Tascii])
AC_CACHE_VAL(mc_cv_nroff_tascii, [
mc_cv_nroff_tascii=
nroff -Tlatin1 < /dev/null > /dev/null 2>&1 /dev/null
if test $? = 0; then
mc_cv_nroff_tascii=-Tlatin1
else
nroff -Tascii < /dev/null > /dev/null 2>&1 /dev/null
if test $? = 0; then
mc_cv_nroff_tascii=-Tascii
fi
fi
])
AC_MSG_RESULT([${mc_cv_nroff_tascii-no}])
MAN_FLAGS="$MAN_FLAGS $mc_cv_nroff_tascii"
fi
AC_SUBST(MANDOC)
AC_SUBST(MAN_FLAGS)
dnl Check for -L option to file
AC_CHECK_PROG(HAVE_FILECMD, file, true, false)
if $HAVE_FILECMD; then
AC_MSG_CHECKING([for -L option to file command])
AC_CACHE_VAL(mc_cv_filel, [
file -L . > /dev/null 2>&1
if test $? = 0; then
mc_cv_filel=yes
else
mc_cv_filel=no
fi
])
if test x$mc_cv_filel = xyes; then
AC_DEFINE(FILE_L, 1, [Define if the file command accepts the -L option])
fi
filel=$mc_cv_filel
AC_MSG_RESULT([$filel])
fi
dnl Only list browsers here that can be run in background (i.e. with `&')
AC_CHECK_PROGS(X11_WWW, [gnome-moz-remote mozilla firefox konqueror opera])
dnl ############################################################################
dnl Check for other tools
dnl ############################################################################
AC_CHECK_TOOL(AR, ar, ar)
mc_UNIT_TESTS
dnl ############################################################################
dnl Check for main libraies
dnl ############################################################################
mc_CHECK_GLIB
mc_G_MODULE_SUPPORTED
mc_WITH_SCREEN
mc_CHECK_SEARCH_TYPE
dnl X11 support. Used to read keyboard modifiers when running under X11.
mc_WITH_X
dnl ############################################################################
dnl Check for header files
dnl ############################################################################
AC_CHECK_HEADERS([string.h memory.h limits.h malloc.h \
utime.h sys/statfs.h sys/vfs.h \
sys/select.h sys/ioctl.h stropts.h arpa/inet.h \
sys/socket.h])
AC_HEADER_MAJOR
dnl ############################################################################
dnl Check for types
dnl ############################################################################
dnl Check largefile before type sizeof checks
AC_SYS_LARGEFILE
AC_CHECK_SIZEOF(long)
AC_TYPE_UINTMAX_T
AC_CHECK_SIZEOF(uintmax_t)
AC_TYPE_OFF_T
AC_CHECK_SIZEOF(off_t)
AC_TYPE_MODE_T
gl_PROMOTED_TYPE_MODE_T
AC_TYPE_PID_T
AC_TYPE_UID_T
AC_STRUCT_ST_BLOCKS
AC_CHECK_MEMBERS([struct stat.st_blksize, struct stat.st_rdev])
gl_STAT_SIZE
AH_TEMPLATE([sig_atomic_t],
[/* Define to `int' if <signal.h> doesn't define.])
AH_TEMPLATE([SIG_ATOMIC_VOLATILE_T],
[Some systems declare sig_atomic_t as volatile, some others -- no.
This define will have value `sig_atomic_t' or
`volatile sig_atomic_t' accordingly.])
AC_MSG_CHECKING(for sig_atomic_t in signal.h)
AC_EGREP_HEADER(sig_atomic_t,signal.h,
[
ac_cv_type_sig_atomic_t=yes;
AC_EGREP_HEADER(volatile.*sig_atomic_t,
signal.h,
[
is_sig_atomic_t_volatile=yes;
AC_MSG_RESULT([yes, volatile])
],
[
is_sig_atomic_t_volatile=no;
AC_MSG_RESULT([yes, non volatile])
])
],
[
AC_MSG_RESULT(no)
AC_CHECK_TYPE(sig_atomic_t, int)
is_sig_atomic_t_volatile=no
])
if test $is_sig_atomic_t_volatile = 'yes'
then
AC_DEFINE(SIG_ATOMIC_VOLATILE_T, sig_atomic_t)
else
AC_DEFINE(SIG_ATOMIC_VOLATILE_T, [volatile sig_atomic_t])
fi
dnl ############################################################################
dnl Check for functions
dnl ############################################################################
AC_CHECK_FUNCS([\
strverscmp \
strncasecmp \
realpath
])
dnl utimensat is supported since glibc 2.6 and specified in POSIX.1-2008
AC_CHECK_FUNCS([utimensat])
dnl getpt is a GNU Extension (glibc 2.1.x)
AC_CHECK_FUNCS(posix_openpt, , [AC_CHECK_FUNCS(getpt)])
AC_CHECK_FUNCS(grantpt, , [AC_CHECK_LIB(pt, grantpt)])
dnl replacing lstat with statlstat on sco makes it more portable between
dnl sco clones
AC_CHECK_FUNCS(statlstat)
dnl Ovverriding mmap support. This has to be before AC_FUNC_MMAP is used.
dnl We use only part of the functionality of mmap, so on AIX,
dnl it's possible to use mmap, even if it doesn't pass the autoconf test.
AC_ARG_WITH([mmap],
AS_HELP_STRING([--with-mmap], [Use the mmap call @<:@yes if found@:>@]))
if test x$with_mmap != xno; then
if test x$with_mmap = x; then
AC_FUNC_MMAP
else
AC_DEFINE(HAVE_MMAP, 1)
fi
fi
dnl Sequent wants getprocessstats
AC_CHECK_LIB(seq, get_process_stats, [
LIBS="$LIBS -lseq"
AC_DEFINE(HAVE_GET_PROCESS_STATS, 1,
[Define if you have function `get_process_stats' and
have to use that instead of gettimeofday])])
mc_AC_GET_FS_INFO
dnl ############################################################################
dnl Internationalization
dnl ############################################################################
AM_GNU_GETTEXT([no-libtool], [need-ngettext])
AM_GNU_GETTEXT_VERSION([0.18.1])
mc_I18N
dnl ############################################################################
dnl OS specific flags
dnl ############################################################################
case $host_os in
aux*)
# A/UX
LIBS="$LIBS -lposix"
AC_DEFINE(_POSIX_SOURCE)
;;
esac
dnl If running under AIX, AC_AIX does not tell us that
AC_MSG_CHECKING([for AIX defines])
AC_EGREP_CPP([yes],
[
#if defined(AIX) || defined(_AIX) || defined(__aix__) || defined(aix)
yes
#endif
],
[
AC_DEFINE(IS_AIX, 1, [Define if compiling for AIX])
AC_MSG_RESULT(yes)
],
[
AC_MSG_RESULT(no)
])
dnl Check if the OS is supported by the console saver.
cons_saver=""
case $host_os in
linux*)
cons_saver=yes
esac
dnl Check for gpm mouse support (Linux only)
mouse_lib="xterm only"
AC_ARG_WITH([gpm-mouse],
AS_HELP_STRING([--with-gpm-mouse], [Compile with gpm mouse support (Linux only) @<:@yes if found@:>@]))
case $host_os in
linux*)
if test x$with_gpm_mouse != xno; then
AC_CHECK_LIB(gpm, Gpm_Repeat,
[AC_DEFINE(HAVE_LIBGPM, 1,
[Define to enable gpm mouse support on Linux])
mouse_lib="gpm and xterm"
MCLIBS="$MCLIBS -lgpm"],
if test "x$with_gpm_mouse" = "xyes"; then
[AC_MSG_ERROR([libgpm is missing or older than 0.18])]
else
[AC_MSG_WARN([libgpm is missing or older than 0.18])]
fi
)
fi
;;
esac
dnl ############################################################################
dnl libmc
dnl ############################################################################
LIBMC_VERSION="0.0.1"
LIBMC_RELEASE="1"
AC_SUBST(LIBMC_VERSION)
AC_SUBST(LIBMC_RELEASE)
AC_ARG_ENABLE([mclib],
[AS_HELP_STRING([--enable-mclib], [Compile shared library libmc.so @<:@no@:>@])],
[
if test "x$enableval" = "xno" ; then
enable_mclib=no
else
if test "x$enable_shared" = "xno" ; then
AC_MSG_WARN([Build of shared library is disabled. Specify --enable-shared first])
enable_mclib=no
else
enable_mclib=yes
fi
fi
],
[enable_mclib=no])
AM_CONDITIONAL([ENABLE_MCLIB], [test x$enable_mclib = xyes])
dnl ############################################################################
dnl Where config files should be placed
dnl ############################################################################
AC_ARG_WITH([homedir],
AS_HELP_STRING([--with-homedir],
[Choose any place of user settings relative to home dir, or XDG for respect XDG standards @<:@XDG@:>@]),
[
if test "x$withval" = "xXDG"; then
with_homedir=XDG
else
with_homedir=$withval
fi
],
[with_homedir=XDG])
if test x$with_homedir = xXDG; then
AC_DEFINE(MC_HOMEDIR_XDG, 1, [Define to enable XDG standard support])
else
AC_DEFINE(MC_HOMEDIR_XDG, 0, [Define to disable XDG standard support])
AC_DEFINE_UNQUOTED([MC_USERCONF_DIR], ["$with_homedir"], [Where configs will be placed relative to $HOME])
fi
dnl ############################################################################
dnl MC options
dnl ############################################################################
mc_ASSERT
mc_WITH_INTERNAL_EDIT
dnl Diff viewer support.
AC_ARG_WITH([diff_viewer],
AS_HELP_STRING([--with-diff-viewer], [Compile with diff viewer @<:@yes@:>@]))
if test x$with_diff_viewer != xno; then
AC_DEFINE(USE_DIFF_VIEW, 1, [Define to enable diff viewer])
use_diff=yes
diff_msg="yes"
AC_MSG_NOTICE([using diff viewer])
else
diff_msg="no"
fi
mc_SUBSHELL
mc_BACKGROUND
mc_VFS_CHECKS
dnl ############################################################################
dnl Directories
dnl ############################################################################
dnl ${prefix} and ${exec_prefix} are undefined here if --prefix is not used in command line
dnl Let define ${prefix} and ${exec_prefix}
test "x$prefix" = "xNONE" && prefix="$ac_default_prefix"
test "x$exec_prefix" = "xNONE" && exec_prefix="${prefix}"
if test x${libexecdir} = x'${exec_prefix}/libexec'; then
EXTHELPERSDIR=${prefix}/libexec/${PACKAGE}/ext.d
elif test x${libexecdir} = x'${exec_prefix}/lib'; then
EXTHELPERSDIR=${prefix}/lib/${PACKAGE}/ext.d
else
EXTHELPERSDIR=${libexecdir}/${PACKAGE}/ext.d
fi
AC_SUBST(EXTHELPERSDIR)
dnl ############################################################################
dnl Documentation
dnl ############################################################################
MAN_DATE="$(LC_ALL=C date "+%B %Y")"
AC_SUBST(MAN_DATE)
dnl Determine which help translations we want to install.
ALL_DOC_LINGUAS="es hu it pl ru sr"
DOC_LINGUAS=
if test "x$USE_NLS" = xyes; then
if test -z "$LINGUAS"; then
langs="`grep -v '^#' $srcdir/po/LINGUAS`"
else
langs="$LINGUAS"
fi
else
langs=
fi
for h_lang in $ALL_DOC_LINGUAS; do
for lang in $langs; do
if test "$lang" = "$h_lang"; then
DOC_LINGUAS="$DOC_LINGUAS $lang"
break
fi
done
done
AC_SUBST(DOC_LINGUAS)
DX_HTML_FEATURE(ON)
DX_CHM_FEATURE(OFF)
DX_CHI_FEATURE(OFF)
DX_MAN_FEATURE(OFF)
DX_RTF_FEATURE(OFF)
DX_XML_FEATURE(OFF)
DX_PDF_FEATURE(OFF)
DX_PS_FEATURE(OFF)
DX_INIT_DOXYGEN(mc,doxygen.cfg,devel)
dnl ############################################################################
dnl Configure results
dnl ############################################################################
CFLAGS="$mc_configured_cflags $CFLAGS_OPTS $CFLAGS"
AC_SUBST(MCLIBS)
AC_SUBST(CFLAGS)
AC_SUBST(CPPFLAGS)
AC_SUBST(LDFLAGS)
AC_SUBST(LIBS)
AM_CONDITIONAL(USE_NLS, [test x"$USE_NLS" = xyes])
AM_CONDITIONAL(USE_MAINTAINER_MODE, [test x"$USE_MAINTAINER_MODE" = xyes])
AM_CONDITIONAL(USE_SCREEN_SLANG, [test x"$with_screen" = xslang])
AM_CONDITIONAL(USE_INTERNAL_EDIT, [test x"$use_internal_edit" = xyes ])
AM_CONDITIONAL(USE_ASPELL, [test x"$enable_aspell" = xyes ])
AM_CONDITIONAL(USE_DIFF, [test -n "$use_diff"])
AM_CONDITIONAL(CHARSET, [test -n "$have_charset"])
AM_CONDITIONAL(CONS_SAVER, [test -n "$cons_saver"])
dnl Clarify do we really need GModule
AM_CONDITIONAL([HAVE_GMODULE], [test -n "$g_module_supported" && \
test x"$textmode_x11_support" = x"yes" -o x"$enable_aspell" = x"yes"])
AC_DEFINE_UNQUOTED([MC_CONFIGURE_ARGS], ["$ac_configure_args"], [MC configure arguments])
AC_CONFIG_FILES(
[
src/man2hlp/man2hlp
],
[
chmod +x src/man2hlp/man2hlp
])
AC_CONFIG_FILES([
Makefile
contrib/Makefile
contrib/dist/Makefile
contrib/dist/gentoo/Makefile
contrib/dist/redhat/Makefile
contrib/dist/redhat/mc.spec
contrib/dist/pkginfo
contrib/dist/prototype
misc/Makefile
misc/mc.menu
misc/mcedit.menu
misc/skins/Makefile
misc/ext.d/Makefile
misc/ext.d/doc.sh
misc/ext.d/misc.sh
misc/ext.d/text.sh
misc/ext.d/web.sh
misc/macros.d/Makefile
misc/mc.ext
src/Makefile
src/consaver/Makefile
src/editor/Makefile
src/man2hlp/Makefile
src/subshell/Makefile
src/viewer/Makefile
src/diffviewer/Makefile
src/filemanager/Makefile
src/vfs/Makefile
src/vfs/cpio/Makefile
src/vfs/extfs/Makefile
src/vfs/extfs/helpers/Makefile
src/vfs/extfs/helpers/a+
src/vfs/extfs/helpers/apt+
src/vfs/extfs/helpers/audio
src/vfs/extfs/helpers/deb
src/vfs/extfs/helpers/deba
src/vfs/extfs/helpers/debd
src/vfs/extfs/helpers/dpkg+
src/vfs/extfs/helpers/iso9660
src/vfs/extfs/helpers/hp48+
src/vfs/extfs/helpers/lslR
src/vfs/extfs/helpers/mailfs
src/vfs/extfs/helpers/patchfs
src/vfs/extfs/helpers/rpms+
src/vfs/extfs/helpers/s3+
src/vfs/extfs/helpers/uace
src/vfs/extfs/helpers/ualz
src/vfs/extfs/helpers/uar
src/vfs/extfs/helpers/uarc
src/vfs/extfs/helpers/uarj
src/vfs/extfs/helpers/uc1541
src/vfs/extfs/helpers/ucab
src/vfs/extfs/helpers/uha
src/vfs/extfs/helpers/ulha
src/vfs/extfs/helpers/ulib
src/vfs/extfs/helpers/urar
src/vfs/extfs/helpers/uzip
src/vfs/extfs/helpers/uzoo
src/vfs/fish/Makefile
src/vfs/fish/helpers/Makefile
src/vfs/ftpfs/Makefile
src/vfs/sftpfs/Makefile
src/vfs/local/Makefile
src/vfs/sfs/Makefile
src/vfs/smbfs/Makefile
src/vfs/tar/Makefile
src/vfs/undelfs/Makefile
lib/Makefile
lib/event/Makefile
lib/filehighlight/Makefile
lib/mcconfig/Makefile
lib/search/Makefile
lib/skin/Makefile
lib/strutil/Makefile
lib/tty/Makefile
lib/vfs/Makefile
lib/widget/Makefile
misc/syntax/Makefile
misc/syntax/Syntax
doc/Makefile
doc/hints/Makefile
doc/hints/l10n/Makefile
doc/man/Makefile
doc/man/es/Makefile
doc/man/hu/Makefile
doc/man/it/Makefile
doc/man/pl/Makefile
doc/man/ru/Makefile
doc/man/sr/Makefile
doc/hlp/Makefile
doc/hlp/es/Makefile
doc/hlp/hu/Makefile
doc/hlp/it/Makefile
doc/hlp/pl/Makefile
doc/hlp/ru/Makefile
doc/hlp/sr/Makefile
intl/Makefile
po/Makefile.in
])
AC_CONFIG_FILES([
tests/Makefile
tests/lib/Makefile
tests/lib/mcconfig/Makefile
tests/lib/search/Makefile
tests/lib/strutil/Makefile
tests/lib/vfs/Makefile
tests/lib/widget/Makefile
tests/src/Makefile
tests/src/filemanager/Makefile
tests/src/editor/Makefile
tests/src/editor/test-data.txt
tests/src/vfs/Makefile
tests/src/vfs/extfs/Makefile
tests/src/vfs/extfs/helpers-list/Makefile
tests/src/vfs/extfs/helpers-list/data/config.sh
tests/src/vfs/extfs/helpers-list/misc/Makefile
])
AC_OUTPUT
AC_MSG_NOTICE([
Configuration:
Source code location: ${srcdir}
Compiler: ${CC}
Compiler flags: ${CFLAGS}
Assertions: ${enable_assert}
Unit tests: ${tests_msg}
File system: ${vfs_type}
${vfs_flags}
Screen library: ${screen_msg}
Mouse support: ${mouse_lib}
X11 events support: ${textmode_x11_support}
With subshell support: ${subshell}
With background operations: ${enable_background}
Internal editor: ${edit_msg}
Diff viewer: ${diff_msg}
Support for charset: ${charset_msg}
Search type: ${SEARCH_TYPE}
])
dnl option checking is disable by default due to AC_CONFIG_SUBDIRS
dnl we enable it back for top-level ./configure
if test -n "$ac_unrecognized_opts"; then
case $enable_option_checking in
fatal) AC_MSG_ERROR([unrecognized options: $ac_unrecognized_opts]) ;;
*) AC_MSG_WARN( [unrecognized options: $ac_unrecognized_opts]) ;;
esac
fi