Description of problem:
Package ascend fails to build from source in Fedora Rawhide.

Package ida was not found in the pkg-config search path.
Perhaps you should add the directory containing `ida.pc'
to the PKG_CONFIG_PATH environment variable
No package 'ida' found
FAILED SUNDIALS DETECTION (Linux): <type 'exceptions.OSError'> '/usr/bin/pkg-config ida --libs --cflags' exited 1

...
Checking for IDA... KeyError: 'SUNDIALS_LIBS':
  File "/builddir/build/BUILD/ascend/SConstruct", line 2381:
    elif not conf.CheckIDA():
  File "/usr/lib/scons/SCons/SConf.py", line 658:
    ret = self.test(context, *args, **kw)
  File "/builddir/build/BUILD/ascend/SConstruct", line 1710:
    context.env.AppendUnique(LIBS=context.env['SUNDIALS_LIBS'])
  File "/usr/lib/scons/SCons/Environment.py", line 410:
    return self._dict[key]
RPM build errors:
error: Bad exit status from /var/tmp/rpm-tmp.TDT5kQ (%build)
    Bad exit status from /var/tmp/rpm-tmp.TDT5kQ (%build)

Dependency changes in buildroot between last successful build and failing build:
 	sundials-devel 	2.7.0-2.fc26 	> 	2.7.0-3.fc26
	sundials 	2.7.0-2.fc26 	> 	2.7.0-3.fc26
	libX11-devel 	1.6.3-3.fc24 	> 	1.6.4-1.fc26
	SuperLUMT-double 	3.1.0-7.fc26 	> 	3.1.0-8.fc26
	libjpeg-turbo 	1.5.0-4.fc26 	> 	1.5.1-0.fc26
	libX11 	1.6.3-3.fc24 	> 	1.6.4-1.fc26
	SuperLUMT-common 	3.1.0-7.fc26 	> 	3.1.0-8.fc26
	libX11-common 	1.6.3-3.fc24 	> 	1.6.4-1.fc26
	Lmod 	6.5.13-1.fc26 	> 	6.5.16-1.fc26
	kernel-headers 	4.9.0-0.rc0.git1.1.... 	> 	4.9.0-0.rc0.git2.1....
	gdb-headless 	7.12-0.19.20160929... 	> 	7.12-0.20.20161006...

It seems the failure is related to the change in sundials 2.7.0-3.fc26, because 
pkgconfig files are needed for build.

* Thu Oct 06 2016 Antonio Trande <sagitterATfedoraproject.org> - 2.7.0-3
- SuperLUMT support condizionalized
- Removed pkgconfig files


Additional info:
This package is tracked by Koschei. See:
http://apps.fedoraproject.org/koschei/package/ascend