[Bug 246800] lang/ghc: ghc cannot be installed because ghc is not installed

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246800

--- Comment #7 from Gleb Popov <arrowd at FreeBSD.org> ---
Makes sense. Would following change be helpful?

Index: lang/ghc/Makefile
===================================================================
--- lang/ghc/Makefile   (revision 536651)
+++ lang/ghc/Makefile   (working copy)
@@ -254,6 +254,11 @@
 .if empty(PORT_OPTIONS:MBOOT)
        cd ${BOOT_DIR} && ${CONFIGURE_ENV} ${CONFIGURE_CMD}
--prefix=${BOOT_DIR}
        cd ${BOOT_DIR} && PACKAGES='' ${MAKE_CMD} install
+.else
+# otherwise, make sure we have "ghc" in PATH
+       if ! ${WHICH} -s ghc ; then \
+               echo "No 'ghc' executable is found in your PATH! Turn off BOOT
option." ; false ; \
+       fi
 .endif
 # If DOCS are set, install HsColour in-place
 .if ${PORT_OPTIONS:MDOCS}

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