unanimity: Clarify why GCC 4.9 is used

[Jason Bacon <bacon4000%gmail.com@localhost>]

Module Name:	pkgsrc-wip
Committed By:	Jason Bacon <bacon4000%gmail.com@localhost>
Pushed By:	outpaddling
Date:		Fri Jun 30 11:51:17 2017 -0500
Changeset:	5fb71004ee92d80786d4fbd107631cf5f37493c5

Modified Files:
	unanimity/Makefile

Log Message:
unanimity: Clarify why GCC 4.9 is used

To see a diff of this commit:
https://wip.pkgsrc.org/cgi-bin/gitweb.cgi?p=pkgsrc-wip.git;a=commitdiff;h=5fb71004ee92d80786d4fbd107631cf5f37493c5

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.

diffstat:
 unanimity/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diffs:
diff --git a/unanimity/Makefile b/unanimity/Makefile
index 550c58ba19..089dc3a7f7 100644
--- a/unanimity/Makefile
+++ b/unanimity/Makefile
@@ -24,7 +24,7 @@ MAKE_JOBS_SAFE=	yes
 
 USE_LANGUAGES=	c c++
 USE_CMAKE=	yes
-GCC_REQD=	4.9	# pbcopper requires 4.9 due to use of json
+GCC_REQD=	4.9	# 4.8 would do, but pbcopper requires 4.9 for json
 CMAKE_ARGS=	-DHTSLIB_INCLUDE_DIRS:STRING=${PREFIX}/include/htslib \
 		-DHTSLIB_LIBRARIES:STRING="-L${PREFIX}/lib -lhts" \
 		-DPacBioBAM_INCLUDE_DIRS:STRING=${PREFIX}/include/pbbam \