Index: Makefile
===================================================================
RCS file: /cvs/ports/converters/lastools/Makefile,v
retrieving revision 1.7
diff -u -p -u -p -r1.7 Makefile
--- Makefile	24 Oct 2018 14:27:59 -0000	1.7
+++ Makefile	13 Dec 2018 00:07:07 -0000
@@ -5,7 +5,7 @@ DISTNAME =	lastools-0.20170108
 GH_ACCOUNT =	LAStools
 GH_PROJECT =	LAStools
 GH_TAGNAME =	f00fa125075ea984993057c5916d746cb605835c
-REVISION =	2
+REVISION =	3
 
 CATEGORIES =	converters textproc devel
 
@@ -14,10 +14,15 @@ PERMIT_PACKAGE_CDROM =	Yes
 
 WANTLIB += c m ${COMPILER_LIBCXX}
 
+#c++11
 COMPILER =		base-clang ports-gcc base-gcc
 
 MAKE_FLAGS =	COMPILER="${CXX}" \
 		LINKER="${CXX}"
+# building with ports-gcc generates the following error: 
+# warning.h:32:2: error: #error This file requires compiler
+# and library support for the ISO C++ 2011 standard.
+CXXFLAGS +=	-std=c++11
 
 post-patch:
 	find ${WRKSRC} -name Makefile | xargs sed -i 's/-O3/${CXXFLAGS}/'