Meet AX_CHECK_LIB_USING_HEADER. Also threw X11 back in because why the hell not. configure actually completes successfully now.

autoconf/m4/ax_check_lib_using_header.m4

@@ -0,0 +1,24 @@
+dnl AX_CHECK_LIB_USING_HEADER(lib, function, header, [action-if-found], [action-if-not-found])
+dnl As AC_CHECK_LIB except "function" must be a fully valid function call and "header" the header file in which that function is defined. The benefit is that this can find functions whose symbols have been decorated, e.g. a lot of MinGW stuff.
+
+AC_DEFUN([AX_CHECK_LIB_USING_HEADER],
+[
+dnl	# On Windows OpenGL functions' library symbols don't match their function names. So we have to do it the hard way.
+	
+	AC_MSG_CHECKING(for $2 in $1 using $3)
+	
+	AC_LANG_PUSH(C)
+	
+	LIBS_SAVE=$LIBS
+	LIBS="$LIBS -l$1"
+	AC_LINK_IFELSE(
+		[AC_LANG_PROGRAM([#include <$3>], [$2])],
+		[AC_MSG_RESULT(yes)
+		$4],
+		[AC_MSG_RESULT(no)
+		$5]
+	)
+	LIBS=$LIBS_SAVE
+	
+	AC_LANG_POP(C)
+])

autoconf/m4/bzip.m4

@@ -2,11 +2,10 @@ AC_DEFUN([SM_BZIP],
 [
         AC_REQUIRE([SM_STATIC])
 		
-dnl		# XXX: AC_CHECK_LIB doesn't work correctly on MinGW for BZip.
-dnl		# Hardcoding it because I'm so fed up with this shit.
-		if test "$host_os" != "mingw32"; then
-			AC_CHECK_LIB(bz2, BZ2_bzCompressInit, have_bzip=yes, have_bzip=no)
-		fi
+		AX_CHECK_LIB_USING_HEADER(bz2, 
+			'BZ2_bzCompressInit((bz_stream*) NULL, 0, 0, 0)',
+			bzlib.h, have_bzip=yes, have_bzip=no)
+		
         AC_CHECK_HEADER(bzlib.h, have_bzip_header=yes, have_bzip_header=no)
         AC_ARG_WITH(static-bzip, AS_HELP_STRING([--with-static-bzip],[Statically link bzip]), with_static_bzip=$withval, with_static_bzip=no)
 

autoconf/m4/opengl.m4

@@ -1,23 +1,3 @@
-AC_DEFUN([SM_OPENGL_TRY_LIB],
-[
-dnl	# On Windows OpenGL functions' library symbols don't match their function names. So we have to do it the hard way.
-	
-	AC_MSG_CHECKING(for glBegin in $1)
-	
-	AC_LANG_PUSH(C)
-	
-	LIBS_SAVE=$LIBS
-	LIBS="$LIBS $1"
-	AC_LINK_IFELSE(
-		[AC_LANG_PROGRAM([#include <GL/gl.h>], [glBegin(GL_POINTS)])],
-		[AC_MSG_RESULT(yes)
-		$2],
-		AC_MSG_RESULT(no)
-	)
-	LIBS=$LIBS_SAVE
-	
-	AC_LANG_POP(C)
-])
 
 AC_DEFUN([SM_OPENGL],
 [
@@ -28,10 +8,10 @@ AC_DEFUN([SM_OPENGL],
 	
 	GL_LIBS=""
 	
-	SM_OPENGL_TRY_LIB(-lGL, [GL_LIBS="-lGL"])
+	AX_CHECK_LIB_USING_HEADER(GL, 'glBegin(GL_POINTS)', GL/gl.h, [GL_LIBS="-lGL"])
 	
 	if test x$GL_LIBS = "x"; then
-	SM_OPENGL_TRY_LIB(-lopengl32, [GL_LIBS="-lopengl32"])
+	AX_CHECK_LIB_USING_HEADER(opengl32, 'glBegin(GL_POINTS)', GL/gl.h, [GL_LIBS="-lopengl32"])
 	fi
 	if test x$GL_LIBS = "x"; then
 			AC_MSG_ERROR("No usable OpenGL library found.")

configure.ac

@@ -183,12 +183,9 @@ if test "$with_prof" = "yes"; then
 fi
 
 SM_OPENGL
-if test "$host_os" != "mingw32"; then
-	SM_X11
-	GL_CFLAGS="$GL_CFLAGS $XCFLAGS"
-	GL_LIBS="$GL_LIBS $XLIBS"
-	# XXX Actually use GL_* (probably should replace $X* for the most part)
-fi
+SM_X11
+GL_CFLAGS="$GL_CFLAGS $XCFLAGS"
+GL_LIBS="$GL_LIBS $XLIBS"
 
 have_libpng=yes
 SM_STATIC
@@ -333,7 +330,22 @@ AC_CHECK_DECL(strtof, , AC_DEFINE([NEED_STRTOF],1,[Need strtof]), [#include <std
 
 AC_CHECK_DECLS([SIGPWR, SIGUSR1],,,[#include <signal.h>])
 
-PKG_CHECK_MODULES( [GLEW], [glew >= 1.3.5], LIBS="$LIBS -lGLEW" )
+have_glew="no"
+AX_CHECK_LIB_USING_HEADER(GLEW, 'glewInit()', GL/glew.h,
+	have_glew="yes"
+	LIBS="$LIBS -lGLEW", 
+	,
+	[$LIBS])
+	
+test $have_glew = "no" && { AX_CHECK_LIB_USING_HEADER(glew32, 'glewInit()', GL/glew.h,
+	have_glew="yes"
+	LIBS="$LIBS -lglew32",
+	,
+	[$LIBS]) }
+
+test $have_glew = "no" && AC_MSG_ERROR("Could not find GLEW.")
+
+AC_CHECK_DECL(GLEW_VERSION_2_1, , AC_MSG_ERROR("GLEW 1.3.5 or newer is required."), [#include <GL/glew.h>])
 
 AC_ARG_ENABLE(tests, AS_HELP_STRING([--enable-tests],[Build test programs]), enable_tests=$enableval, enable_tests=no)
 AM_CONDITIONAL(BUILD_TESTS, test "$enable_tests" = "yes" )

src/Makefile.am

@@ -21,7 +21,7 @@ AM_CXXFLAGS += -fno-exceptions
 # generates enormous output.
 AM_CXXFLAGS += -finline-limit=300
 
-AM_CXXFLAGS += $(XCFLAGS)
+AM_CXXFLAGS += $(GL_CFLAGS)
 
 LIBS += 
 LIBS += -lpthread -lrt
@@ -637,7 +637,7 @@ endif
 main_LDADD = \
 		$(VIDEO_LIBS) \
 		$(AUDIO_LIBS) \
-		$(XLIBS) \
+		$(GL_LIBS) \
 		libtomcrypt.a libtommath.a
 
 nodist_stepmania_SOURCES = ver.cpp