diff -udprN /usr/ports/math/tetgen/Makefile ./Makefile
--- /usr/ports/math/tetgen/Makefile	2018-06-14 08:34:32.000000000 +0000
+++ ./Makefile	2018-08-28 16:38:06.836781000 +0000
@@ -3,6 +3,7 @@
 
 PORTNAME=	tetgen
 PORTVERSION=	1.5.0.20131104
+PORTREVISION=	1
 CATEGORIES=	math
 MASTER_SITES=	http://wias-berlin.de/software/tetgen/1.5/src/
 DISTNAME=	${PORTNAME}${PORTVERSION:R}
@@ -22,6 +23,9 @@ PLIST_FILES=	bin/tetgen include/tetgen.h
 
 OPTIONS_DEFINE=	EXAMPLES
 
+pre-patch:
+	${REINPLACE_CMD} 's|x%lx|x%x|' ${WRKSRC}/tetgen.cxx
+
 do-install:
 	${INSTALL_PROGRAM} ${WRKSRC}/tetgen ${STAGEDIR}${PREFIX}/bin
 	${INSTALL_DATA} ${WRKSRC}/tetgen.h ${STAGEDIR}${PREFIX}/include
diff -udprN /usr/ports/math/tetgen/files/patch-makefile ./files/patch-makefile
--- /usr/ports/math/tetgen/files/patch-makefile	2014-08-31 20:23:50.000000000 +0000
+++ ./files/patch-makefile	2018-08-28 16:38:06.842403000 +0000
@@ -1,5 +1,5 @@
---- makefile.orig	2013-11-06 15:26:24.000000000 -0500
-+++ makefile	2014-08-29 10:51:57.000000000 -0500
+--- makefile.orig	2013-11-06 20:26:24 UTC
++++ makefile
 @@ -11,7 +11,7 @@
  # CXX should be set to the name of your favorite C++ compiler.
  # ===========================================================
@@ -9,7 +9,7 @@
  #CXX = icpc
  #CXX = CC
  
-@@ -19,7 +19,7 @@
+@@ -19,7 +19,7 @@ CXX = g++
  # -O2, -O3 ... to find the best optimization level.
  # ===================================================================
  
@@ -18,7 +18,7 @@
  
  # PREDCXXFLAGS is for compiling J. Shewchuk's predicates. 
  
-@@ -36,7 +36,7 @@
+@@ -36,7 +36,7 @@ PREDCXXFLAGS = -O0
  #   down the speed of TetGen.  They can be skipped by define the -DNDEBUG
  #   switch.
  
@@ -27,3 +27,21 @@
  
  # RM should be set to the name of your favorite rm (file deletion program).
  
+@@ -45,14 +45,14 @@ RM = /bin/rm
+ # The action starts here.
+ 
+ tetgen:	tetgen.cxx predicates.o
+-	$(CXX) $(CXXFLAGS) $(SWITCHES) -o tetgen tetgen.cxx predicates.o -lm
++	$(CXX) $(CXXFLAGS) $(SWITCHES) -o tetgen tetgen.cxx predicates.o -lm -fPIC
+ 
+ tetlib: tetgen.cxx predicates.o
+-	$(CXX) $(CXXFLAGS) $(SWITCHES) -DTETLIBRARY -c tetgen.cxx
++	$(CXX) $(CXXFLAGS) $(SWITCHES) -DTETLIBRARY -c tetgen.cxx -fPIC
+ 	ar r libtet.a tetgen.o predicates.o
+ 
+ predicates.o: predicates.cxx
+-	$(CXX) $(PREDCXXFLAGS) -c predicates.cxx
++	$(CXX) $(PREDCXXFLAGS) -c predicates.cxx -fPIC
+ 
+ clean:
+ 	$(RM) *.o *.a tetgen *~