* gnu/packages/engineering.scm (fasthenry): New variable. * gnu/packages/patches/fasthenry-spAllocate.patch, gnu/packages/patches/fasthenry-spBuild.patch, gnu/packages/patches/fasthenry-spFactor.patch, gnu/packages/patches/fasthenry-spSolve.patch, gnu/packages/patches/fasthenry-spUtils.patch: New files. * gnu-system.am (dist_patch_DATA): Add them.