Enable FreeBSD Compile

Added include and library paths for opengl and jpeg.

Changed make_installer to handle FreeBSD's libSDL.so, which is not a
symbolic link. Also switched to 'bash' because the built-in pwd command
in 'sh' produces a minor error if the wings directory is a symbolic
link.

NOTE: Wings now compiles cleanly on FreeBSD.

plugins_src/accel/Makefile

@@ -46,7 +46,7 @@ else
    GL_LIBS =
  else
    LIBS = -shared -fpic
-   GL_LIBS = -lGLU -lGL
+   GL_LIBS = -L/usr/local/lib -lGLU -lGL
    CFLAGS = $(COMMON_CFLAGS)
  endif
 endif

plugins_src/jpeg/Makefile

@@ -60,6 +60,7 @@ else
 $(LIBDIR)/wings_jpeg_image_drv.so: wings_jpeg_image_drv.c
 	install -d $(LIBDIR)
 	gcc -o $(LIBDIR)/wings_jpeg_image_drv.so -I$(ERL_INC) \
+	-I/usr/local/include -L/usr/local/lib \
   wings_jpeg_image_drv.c $(LIBS)
 
 endif

unix/make_installer

@@ -1,4 +1,4 @@
-#!/bin/sh
+#!/usr/bin/env bash
 #
 # Script for creating a self-contained Wings package for Unix systems.
 #
@@ -96,6 +96,7 @@ sdl_lib=`ldd "$dest/priv/sdl_driver.so" | awk '$1 ~ /^libSDL/ { print $3}'`
 sdl_lib_name=`basename $sdl_lib`
 if [ ! -L $sdl_lib ]; then
     echo `basename $0`: "$sdl_lib expected to be a symlink"
+    $INSTALL -c $sdl_lib "$dest/priv"
 else
     lib_dir=`dirname $sdl_lib`
     linkname=`readlink $sdl_lib`