app-office/texmacs: fix build failure on 32-bit hosts, bug #652054

C compiler compiles this code for bot int-based and size_t-based
guile. C++ compiler does not (and is what used by texmacs).

Closes: https://bugs.gentoo.org/652054
Package-Manager: Portage-2.3.28, Repoman-2.3.9

app-office/texmacs/files/texmacs-1.99.6-guile-size_t.patch

@@ -0,0 +1,21 @@
+C compiler compiles this code for bot int-based and size_t-based
+guile. C++ compiler does not (and is what used by texmacs).
+
+https://bugs.gentoo.org/652054
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 37e9e87..5de2711 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -274,11 +274,11 @@ SET(CMAKE_REQUIRED_FLAGS "-Werror ${Guile_CFLAGS}")
+ SET(CMAKE_REQUIRED_INCLUDES ${Guile_INCLUDE_DIRS})
+ SET(CMAKE_REQUIRED_LIBRARIES ${Guile_LIBRARIES})
+
+ MESSAGE(STATUS "Checking the size_t of guile strings")
+
+-CHECK_C_SOURCE_COMPILES(  "#include <guile/gh.h>
++CHECK_CXX_SOURCE_COMPILES(  "#include <guile/gh.h>
+   #include <libguile.h>
+   void print_string (SCM s) {
+     int len_r;
+     char* r= gh_scm2newstr (s, &len_r); } int main() { return 0; }
+ " _guile_str_size_test)

app-office/texmacs/texmacs-1.99.6-r2.ebuild

@@ -51,6 +51,9 @@ PATCHES=(
 	"${FILESDIR}"/${PN}-1.99-remove-new-declaration.patch
 
 	"${FILESDIR}"/${PN}-1.99.6-math_util.patch
+
+	# fix build failure on 32-bit systems, bug #652054
+	"${FILESDIR}"/${PN}-1.99.6-guile-size_t.patch
 )
 
 src_configure() {