As far as I can tell, glcomp does not use gtkglext. Smyrna, which depends on
glcomp, does. But Smyrna specifies its own linking against gtkglext.
AM_CPPFLAGS = \
-I$(top_srcdir)/lib \
-I$(top_srcdir)/lib/common \
- $(GTK_CFLAGS:-I%=-isystem%) $(GLUT_CFLAGS) $(GTKGL_CFLAGS) $(GTKGLEXT_CFLAGS) $(GLADE_CFLAGS) $(FREETYPE2_CFLAGS) $(XRENDER_CFLAGS)
+ $(GTK_CFLAGS:-I%=-isystem%) $(GLUT_CFLAGS) $(GTKGL_CFLAGS) $(GLADE_CFLAGS) $(FREETYPE2_CFLAGS) $(XRENDER_CFLAGS)
if WITH_SMYRNA
noinst_HEADERS = glcompbutton.h glcompdefs.h glcomplabel.h \