* gnu/packages/games.scm (enigma)[arguments]: Add phase to substitute faulty
comparison.
(list "--with-system-enet")
#:phases
(modify-phases %standard-phases
+ (add-after 'unpack 'fix-build-with-new-gcc
+ (lambda _
+ ;; Fix build with GCC6 and later by avoiding comparing ifstream
+ ;; to NULL. Can be removed for versions > 1.21.
+ (substitute* "src/lev/Proxy.cc"
+ (("ifs != NULL")
+ "ifs"))
+ #t))
(add-after 'unpack 'find-sdl
(lambda _
(substitute* "configure"