1 files changed, 1 insertions, 1 deletions
diff --git a/aclocal.m4 b/aclocal.m4
index 21fcec9..3884f20 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -69,7 +69,7 @@ AC_DEFUN(ZINC_ENABLE_GL, [
 	    GL_LIBS=-lopengl32
 	else
  	  GL_LIBS="-lGL"
- 	  GL_INCLUDES='/usr/include'
+ 	  GL_INCLUDES='-I/usr/include'
         fi
 
  	AC_DEFINE(GL)