Index: Makefile
===================================================================
--- Makefile	(revision 469266)
+++ Makefile	(working copy)
@@ -18,17 +18,19 @@
 LICENSE=	BSD3CLAUSE
 LICENSE_FILE=	${WRKSRC}/LICENSE
 
-USES=		fortran
+OPTIONS_DEFINE=         PROFILE SHARED STATIC
+OPTIONS_DEFINE_amd64=   FLANG
+OPTIONS_DEFAULT=        SHARED STATIC
+PROFILE_DESC=           Build profiling libraries
+SHARED_DESC=            Build shared libraries and PIC archives
+STATIC_DESC=            Build (non-PIC) archives
+FLANG_DESC=             Use experimental flang instead of default Fortran compiler
+FLANG_USES=             fortran:flang
+FLANG_USES_OFF=         fortran
 
-OPTIONS_DEFINE=	PROFILE SHARED STATIC
-OPTIONS_DEFAULT=	SHARED STATIC
-PROFILE_DESC=	Build profiling libraries
-SHARED_DESC=	Build shared libraries and PIC archives
-STATIC_DESC=	Build (non-PIC) archives
+MAKE_ENV=               BLASLIB="${BLASLIB}"
+PLIST_SUB=              SVERSION="${SVERSION}"
 
-MAKE_ENV=	BLASLIB="${BLASLIB}"
-PLIST_SUB=	SVERSION="${SVERSION}"
-
 WRKSRC=			${WRKDIR}/lapack-${PORTVERSION}
 WRKSRC_PROFILE=		${WRKSRC}_PROFILE
 WRKSRC_SHARED=		${WRKSRC}_SHARED
@@ -36,6 +38,11 @@
 
 .include <bsd.port.options.mk>
 
+.if ${PORT_OPTIONS:MFLANG}
+EXTRA_PATCHES+=         ${PATCHDIR}/flang-patch-make.inc.example
+.endif
+
+
 .if defined(BLAS_SLAVEPORT)
 ALL_TARGET=		blaslib
 BLASLIB=		../../libblas.a
Index: files/flang-patch-make.inc.example
===================================================================
--- files/flang-patch-make.inc.example	(nonexistent)
+++ files/flang-patch-make.inc.example	(working copy)
@@ -0,0 +1,17 @@
+--- make.inc.example.orig       2018-05-05 11:59:27.891022000 -0700
++++ make.inc.example    2018-05-05 11:59:38.966638000 -0700
+@@ -22,11 +22,11 @@
+ # Timer for the SECOND and DSECND routines
+ #
+ # Default : SECOND and DSECND will use a call to the EXTERNAL FUNCTION ETIME
+-#TIMER    = EXT_ETIME
++TIMER    = EXT_ETIME
+ # For RS6K : SECOND and DSECND will use a call to the EXTERNAL FUNCTION ETIME_
+ # TIMER    = EXT_ETIME_
+ # For gfortran compiler: SECOND and DSECND will use a call to the INTERNAL FUNCTION ETIME
+-TIMER    = INT_ETIME
++#TIMER    = INT_ETIME
+ # If your Fortran compiler does not provide etime (like Nag Fortran Compiler, etc...)
+ # SECOND and DSECND will use a call to the INTERNAL FUNCTION CPU_TIME
+ # TIMER    = INT_CPU_TIME
+

Property changes on: files/flang-patch-make.inc.example
___________________________________________________________________
Added: svn:eol-style
## -0,0 +1 ##
+native
\ No newline at end of property
Added: svn:mime-type
## -0,0 +1 ##
+text/plain
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