HylaFAX+: init at 5.6.0

Create the top-level packages attribute
'hylafaxplus' that builds HylaFAX+ .

Note:
The nobody uid and the nogroup gid
are hardcoded in the package.
The package build recipe file
contains options to modify these ids.

pkgs/servers/hylafaxplus/post-patch.sh

@@ -0,0 +1,25 @@
+# `configure` (maybe others) set `POSIXLY_CORRECT`, which
+# breaks the gcc wrapper script of nixpkgs (maybe others).
+# We simply un-export `POSIXLY_CORRECT` after each export so
+# its effects don't apply within nixpkgs wrapper scripts.
+grep -rlF POSIXLY_CORRECT | xargs \
+  sed '/export *POSIXLY_CORRECT/a export -n POSIXLY_CORRECT' -i
+
+# Replace strange default value for the nobody account.
+if test -n "@maxuid@"
+then
+  for f in util/faxadduser.c hfaxd/manifest.h
+  do
+    substituteInPlace "$f" --replace 60002 "@maxuid@"
+  done
+fi
+
+# Replace hardcoded `PATH` variables with proper paths.
+# Note: `findutils` is needed for `faxcron`.
+substituteInPlace faxcover/edit-faxcover.sh.in \
+  --replace 'PATH=/bin' 'PATH="@faxcover_binpath@"'
+substituteInPlace etc/faxsetup.sh.in \
+  --replace 'PATH=/bin' 'PATH="@faxsetup_binpath@"'
+
+# Create `config.site`
+substitute "@configSite@" config.site --subst-var out