/usr/share/dune/aclocal/opengl.m4 is in libdune-common-dev 2.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | ## -*- autoconf -*-
# searches for OpenGL-stuff
# DUNE_PATH_OPENGL()
#
# Call AX_CHECK_OPENGL, but also add the discovered flags too the ALL_PKG_*
# family and add a summary entry. Also make sure that pthreads are supported.
AC_DEFUN([DUNE_PATH_OPENGL],[
dnl use test from autoconf-archive
AC_REQUIRE([AX_CHECK_GL])
# GL_LIBS and GL_CFLAGS already set correctly, they implicitly
# contain pthread support!
# variable for summary
with_opengl="no"
if test "$no_gl" != "yes" ; then
with_opengl="yes (add GL_LIBS to LDADD manually, etc.)"
# need pthreads-stuff in linker commandline as well
AC_SUBST(GL_LDFLAGS, $PTHREAD_CFLAGS)
# GL_CFLAGS contain stuff like -pthread, which according to the gcc
# documentation is a flag for both the preprocessor and the linker. So we
# add it to the preprocessor flags here.
AC_SUBST(GL_LIBS, $GL_LIBS)
AC_SUBST(GL_LDFLAGS, $GL_LDFLAGS)
AC_SUBST(GL_CPPFLAGS, $GL_CFLAGS)
fi
DUNE_ADD_SUMMARY_ENTRY([OpenGL],[$with_opengl])
])
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