I am trying to install Ruby gem: dep_gecode. It compiles some C extensions, but the compilation fails because the cpp compiler isn't run with properly set include folders.
When I run rake install it automatically creates a Makefile from extconf.rb to compile the extensions. When I edit the Makefile and manually add flag -I/usr/local/include the compilation of the extensions succeeds. But when I re-run rake install the Makefile gets overwritten and compilation fails again. Obviously I need to fix extconf.rb but I don't quite know how.
Now a bit more details. The source for dep_gecode gem is here:
https://github.com/opscode/dep-selector
The extconf.rb file that needs to be changed is here:
https://github.com/opscode/dep-selector/blob/master/ext/dep_gecode/extconf.rb
What I want to change in the generated Makefile is this line:
CPPFLAGS = -I/usr/include -I/usr/include -I/usr/local/include
instead of this one, which is being generated at this moment:
CPPFLAGS = -I/usr/include -I/usr/include
As you see, the include path /usr/local/include is missing. This is a standard include path on FreeBSD systems, which suggests that the problem may be with Rake, not with this particular extconf.rb file.
Any help greatly appreciated.
Edit: I've just found a workaround. It is enough to add this line to extconf.rb to have that folder properly appearing in the generated Makefile:
$CPPFLAGS << "-I/usr/local/include"
Not sure if this would be the right way of dealing with this problem though...
