Peculiar configure behaviour with cleanbuild

[David Llewellyn-Jones]

Hi all,

I'm new to snaps and snapcraft, but have been enjoying learning about
it. Things seemed to be going well until I tried to build using cleanbuild.

The test in configure for glut is failing, even though as far as I can
tell glut is correctly installed. Here's the check I'm using in configure.ac

AC_CHECK_LIB([glut], [glutInit], [], [AC_MSG_ERROR([The glut library is
missing.])])

and here's the tail end of output from running snapcraft -d cleanbuild

...
checking for OPENVDB... yes
checking for glutInit in -lglut... no
configure: error: The glut library is missing.

Initially I just assumed glut wasn't installing correctly, so I built
the following file inside the container using `gcc test.c -lglut`

char glutInit ();
int main () {
	return glutInit ();
}

This worked fine, so I'm really confused as to what the problem might
be. If anyone has any ideas, it'd be a great help.

Here are the complete files I'm using:

configure.ac
https://gitlab.com/flypig/functy/blob/master/configure.ac

snapcraft.yaml
https://gitlab.com/flypig/functy/blob/master/linux/snap/snapcraft.yaml

David
-- 
Website: http://www.flypig.co.uk