Steps to reproduce the issue

spack install gnuplot@5.2.8%gcc@8.4.0 +X +cairo +gd +libcerf +pbm +qt +wx

returns error
Error: KeyError: 'No spec with name wx in gnuplot@5.2.8%gcc@8.4.0+X+cairo+gd+libcerf+pbm+qt+wx patches=ad89f23815fd925889ae78009ba22e6f9e4b12fea389280040cef519deafb052 arch=linux-rhel8-x86_64 ^at-spi2-atk@2 ... (listing all dependencies, etc)

Information on your system

• Spack: 0.14.2
• Python: 3.8.2
• Platform: linux-rhel8-x86_64

Additional information

• spack-build-out.txt
• spack-build-env.txt

General information

• [x ] I have run spack debug report and reported the version of Spack/Python/Platform
• [x ] I have run spack maintainers <name-of-the-package> and @mentioned any maintainers
• I have uploaded the build log and environment files
• [x ] I have searched the issues of this repo and believe this is not a duplicate