Please describe the problem:
At least three applications on my system use a file called gst.h:

gnu smalltalk 2.1g
gstreamer-0.8.8
gnome-system-tools-1.1.91

smalltalk installs a gst.h into ${someprefix}/include/gst.h (one could argue
this is a bug in smalltalk).  So, if one passes CPPFLAGS to configure that
happens to include ${someprefix}/include for other reasons, then the resulting
Makefile will place -I${someprefix}/include BEFORE -I${top_srcdir}/src/common. 
As a result, files like gst-network-tool.c can pick up the wrong gst.h,

It might be worth it to take a pointer from gstreamer and instead of including
gst.h, include common/gst.h, to give it a bit of a name space to protect it.

Steps to reproduce:
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Actual results:


Expected results:


Does this happen every time?


Other information: