OpenGL gtkglext

Hello,

i've updated from Ubuntu 11.04 to 11.10. This was a big mistake because makefiles that worked properly under 9.04 & 11.04 now refuse to work. Here's one detail from a makefile:

# Compiler und Linker
CC = gcc

# Includes und Compiler-Flags
CFLAGS = -Wall -m64 -fopenmp -lm -DFR_UNIX -DFR_XDOUB -DFR_XINT -DFR_GLAREA -I$(SRCDIR) \
         -lGL -lGLU `pkg-config --cflags --libs gtk+-2.0 pangox`

or another example from another makefile:

CC = gcc

CFLAGS = -I$(DIRCOM) -O2 -fomit-frame-pointer -DFR_UNIX -DFR_XDOUB -DFR_XLONG -DFR_LINUX -lm \
`pkg-config --cflags --libs gtk+-2.0 gdkglext-1.0 gdkglext-x11-1.0 gtkglext-1.0 gtkglext-x11-1.0`

Both makefiles quit with error messages concerning the linker: "" cannot find glVertex (and so on) - that means the standard OpenGL stuff.

What goes wrong?

Regards

F.Rieg, University of Bayreuth, Germany