diff --git a/src/Airports/GenAirports/Makefile.am b/src/Airports/GenAirports/Makefile.am
index a353c40d..0f21af5a 100644
--- a/src/Airports/GenAirports/Makefile.am
+++ b/src/Airports/GenAirports/Makefile.am
@@ -40,7 +40,7 @@ genapts_LDADD = \
 	$(top_builddir)/src/Lib/Geometry/libGeometry.a \
 	$(top_builddir)/src/Lib/Output/libOutput.a \
 	$(top_builddir)/src/Lib/TriangleJRS/libTriangleJRS.a \
-	-lsgbucket -lsgdebug -lsgio -lsgmath -lsgmisc -lz -lgpc \
+	-lsgbucket -lsgdebug -lsgio -lsgmath -lsgmisc -lz -lgenpolyclip \
 	$(base_LIBS)
 
 INCLUDES += \
diff --git a/src/BuildTiles/Clipper/Makefile.am b/src/BuildTiles/Clipper/Makefile.am
index 7af44132..f34e3a2c 100644
--- a/src/BuildTiles/Clipper/Makefile.am
+++ b/src/BuildTiles/Clipper/Makefile.am
@@ -13,6 +13,6 @@ testclipper_LDADD = \
 	$(top_builddir)/src/Lib/Polygon/libPolygon.a \
 	$(top_builddir)/src/Lib/landcover/liblandcover.a \
 	$(top_builddir)/src/Lib/poly2tri/libpoly2tri.a \
-	-lsgbucket -lsgdebug -lsgmisc -lz -lgpc
+	-lsgbucket -lsgdebug -lsgmisc -lz -lgenpolyclip
 
 INCLUDES += -I$(top_srcdir)/src/Lib -I$(top_srcdir)/src/BuildTiles
diff --git a/src/BuildTiles/Main/Makefile.am b/src/BuildTiles/Main/Makefile.am
index 12a5f9a0..4b98917a 100644
--- a/src/BuildTiles/Main/Makefile.am
+++ b/src/BuildTiles/Main/Makefile.am
@@ -18,7 +18,7 @@ fgfs_construct_LDADD = \
 	$(top_builddir)/src/Lib/landcover/liblandcover.a \
 	$(top_builddir)/src/Lib/poly2tri/libpoly2tri.a \
 	$(top_builddir)/src/Lib/TriangleJRS/libTriangleJRS.a \
-	-lsgbucket -lsgio -lsgmath -lsgmisc -lsgdebug -lplibsg -lz -lgpc
+	-lsgbucket -lsgio -lsgmath -lsgmisc -lsgdebug -lplibsg -lz -lgenpolyclip
 
 fgfs_master_SOURCES = master.cxx
 
diff --git a/src/Prep/E00Lines/Makefile.am b/src/Prep/E00Lines/Makefile.am
index 8caea46c..38533822 100644
--- a/src/Prep/E00Lines/Makefile.am
+++ b/src/Prep/E00Lines/Makefile.am
@@ -6,6 +6,6 @@ e00lines_LDADD = \
 	$(top_builddir)/src/Lib/Polygon/libPolygon.a \
 	$(top_builddir)/src/Lib/poly2tri/libpoly2tri.a \
 	$(top_builddir)/src/Lib/e00/libe00.a \
-	-lsgdebug -lsgbucket -lsgmisc -lsgmath -lsgio -lz -lgpc
+	-lsgdebug -lsgbucket -lsgmisc -lsgmath -lsgio -lz -lgenpolyclip
 
 INCLUDES += -I$(top_srcdir)/src/Lib
diff --git a/src/Prep/GSHHS/Makefile.am b/src/Prep/GSHHS/Makefile.am
index f2fd5591..edf9fc34 100644
--- a/src/Prep/GSHHS/Makefile.am
+++ b/src/Prep/GSHHS/Makefile.am
@@ -8,7 +8,7 @@ gshhs_SOURCES = \
 gshhs_LDADD = \
 	$(top_builddir)/src/Lib/Polygon/libPolygon.a \
 	$(top_builddir)/src/Lib/poly2tri/libpoly2tri.a \
-	-lsgdebug -lsgbucket -lsgmisc -lz -lgpc
+	-lsgdebug -lsgbucket -lsgmisc -lz -lgenpolyclip
 
 debug_SOURCES = \
 	debug.cxx
@@ -16,6 +16,6 @@ debug_SOURCES = \
 debug_LDADD = \
 	$(top_builddir)/src/Lib/Polygon/libPolygon.a \
 	$(top_builddir)/src/Lib/poly2tri/libpoly2tri.a \
-	-lsgdebug -lsgbucket -lsgmisc -lz -lgpc
+	-lsgdebug -lsgbucket -lsgmisc -lz -lgenpolyclip
 
 INCLUDES += -I$(top_srcdir)/src -I$(top_srcdir)/src/Lib
diff --git a/src/Prep/MergerClipper/Makefile.am b/src/Prep/MergerClipper/Makefile.am
index 04bd1e96..b1e5f8f2 100644
--- a/src/Prep/MergerClipper/Makefile.am
+++ b/src/Prep/MergerClipper/Makefile.am
@@ -10,6 +10,6 @@ testmerger_LDADD = \
 	$(top_builddir)/src/Prep/MergerClipper/libMergerClipper.a \
 	$(top_builddir)/src/Lib/Polygon/libPolygon.a \
 	$(top_builddir)/src/Lib/poly2tri/libpoly2tri.a \
-	-lsgdebug -lsgbucket -lsgmisc -lz -lgpc
+	-lsgdebug -lsgbucket -lsgmisc -lz -lgenpolyclip
 
 INCLUDES += -I$(top_srcdir)/src/Lib
diff --git a/src/Prep/Photo/Makefile.am b/src/Prep/Photo/Makefile.am
index ac269084..9a20aac7 100644
--- a/src/Prep/Photo/Makefile.am
+++ b/src/Prep/Photo/Makefile.am
@@ -36,7 +36,7 @@ photo_LDADD = \
 	$(top_builddir)/src/Lib/Geometry/libGeometry.a \
 	$(top_builddir)/src/Lib/Output/libOutput.a \
 	$(top_builddir)/src/Lib/TriangleJRS/libTriangleJRS.a \
-	-lsgbucket -lsgdebug -lsgio -lsgmath -lsgmisc -lz -lgpc \
+	-lsgbucket -lsgdebug -lsgio -lsgmath -lsgmisc -lz -lgenpolyclip \
 	$(base_LIBS)
 
 wgs84offset_SOURCES = wgs84offset.cxx
diff --git a/src/Prep/ShapeFile/Makefile.am b/src/Prep/ShapeFile/Makefile.am
index da613c52..1fa9f452 100644
--- a/src/Prep/ShapeFile/Makefile.am
+++ b/src/Prep/ShapeFile/Makefile.am
@@ -8,12 +8,12 @@ shape_decode_LDADD = \
 	$(top_builddir)/src/Lib/Polygon/libPolygon.a \
 	$(top_builddir)/src/Lib/poly2tri/libpoly2tri.a \
 	$(top_builddir)/src/Lib/shapelib/libshape.a \
-	-lsgdebug -lsgbucket -lsgmisc -lz -lgpc
+	-lsgdebug -lsgbucket -lsgmisc -lz -lgenpolyclip
 
 noaa_decode_LDADD = \
 	$(top_builddir)/src/Lib/Polygon/libPolygon.a \
 	$(top_builddir)/src/Lib/poly2tri/libpoly2tri.a \
 	$(top_builddir)/src/Lib/shapelib/libshape.a \
-	-lsgdebug -lsgbucket -lsgmisc -lz -lgpc
+	-lsgdebug -lsgbucket -lsgmisc -lz -lgenpolyclip
 
 INCLUDES += -I$(top_srcdir)/src/Lib