--- extconf.rb~	2001-12-01 06:24:58.000000000 +0100
+++ extconf.rb~	2003-06-13 23:24:27.000000000 +0200
@@ -43,8 +43,8 @@ 
 
 $objs = ["glu.o", "ogl.o", "rbogl.o"]
 #have_library("pthread", "pthread_create")
-(have_library(gl_libname, nil) || have_library("Mesa"+gl_libname, nil)) &&
-  (have_library(glu_libname, nil) ||  have_library("Mesa"+glu_libname, nil)) &&
+(have_library(gl_libname, "glBegin") || have_library("Mesa"+gl_libname, "glBegin")) &&
+  (have_library(glu_libname, "gluLookAt") ||  have_library("Mesa"+glu_libname, "gluLookAt")) &&
   create_makefile("opengl")
 if (FileTest.exist? "Makefile")
     open("Makefile") {|f|
@@ -64,7 +64,7 @@ 
 have_library("Xi", "XAllowDeviceEvents") &&
   have_library("Xext", "XMITMiscGetBugMode") &&
   have_library("Xmu", "XmuAddCloseDisplayHook")
-have_library(glut_libname, nil) &&
+have_library(glut_libname, "glutInit") &&
   create_makefile("glut")
 if (FileTest.exist? "Makefile")
     open("Makefile") {|f|