brlcad 7.6.2 cannot be configured to use the system IncrTcl library because
the test for it in configure fails.
This test program includes include/common.h which in turn includes
<brlcad/brlcad_config.h>. This file does not exist if brlcad is not already
installed, the test fails and configure will use itcl packaged with brlcad.
I think the test program in configure should be compiled with -DHAVE_CONFIG_H
so include/common.h includes "brlcad_config.h" instead of
The attached hotfix patches configure and configure.ac to compile the incrTcl
library functionality test with -DHAVE_CONFIG_H.