Import cad/clipper2

The Clipper2 library performs intersection, union, difference and
XOR boolean operations on both simple and complex polygons. It also
performs polygon offsetting.

OK with many improvements sthen@ and jtt@

cad/clipper2/Makefile

@@ -0,0 +1,33 @@
+COMMENT =	library to perform boolean operations on polygons
+
+V =		1.5.4
+PKGNAME =	clipper2-${V}
+GH_ACCOUNT =	AngusJohnson
+GH_PROJECT =	Clipper2
+GH_TAGNAME =	Clipper2_${V}
+
+SHARED_LIBS +=	Clipper2                  0.0 # 0.0
+SHARED_LIBS +=	Clipper2Z                 0.0 # 0.0
+
+CATEGORIES =	cad
+
+HOMEPAGE =	https://www.angusj.com/clipper2
+
+# Boost Software License 1.0
+PERMIT_PACKAGE =	Yes
+
+WANTLIB += ${COMPILER_LIBCXX} m
+
+COMPILER =	base-clang ports-gcc
+
+MODULES =	devel/cmake
+
+WRKSRC =	${WRKDIST}/CPP
+
+BUILD_DEPENDS =	devel/gtest
+
+CONFIGURE_ARGS = -DBUILD_SHARED_LIBS=ON \
+		-DUSE_EXTERNAL_GTEST=ON \
+		-DCLIPPER2_EXAMPLES=OFF
+
+.include <bsd.port.mk>

cad/clipper2/distinfo

@@ -0,0 +1,2 @@
+SHA256 (Clipper2-Clipper2_1.5.4.tar.gz) = nYo1op0EzRt7RfVCwLpIAV/uzhIQA26p5O+q0xQK9LA=
+SIZE (Clipper2-Clipper2_1.5.4.tar.gz) = 625047

cad/clipper2/pkg/DESCR

@@ -0,0 +1,3 @@
+The Clipper2 library performs intersection, union, difference and
+XOR boolean operations on both simple and complex polygons. It also
+performs polygon offsetting.

cad/clipper2/pkg/PLIST

@@ -0,0 +1,28 @@
+include/clipper2/
+include/clipper2/Utils/
+include/clipper2/Utils/ClipFileLoad.h
+include/clipper2/Utils/ClipFileSave.h
+include/clipper2/Utils/Colors.h
+include/clipper2/Utils/CommonUtils.h
+include/clipper2/Utils/Timer.h
+include/clipper2/Utils/clipper.svg.h
+include/clipper2/clipper.core.h
+include/clipper2/clipper.engine.h
+include/clipper2/clipper.export.h
+include/clipper2/clipper.h
+include/clipper2/clipper.minkowski.h
+include/clipper2/clipper.offset.h
+include/clipper2/clipper.rectclip.h
+include/clipper2/clipper.version.h
+lib/cmake/
+lib/cmake/clipper2/
+lib/cmake/clipper2/Clipper2Config.cmake
+lib/cmake/clipper2/Clipper2ConfigVersion.cmake
+lib/cmake/clipper2/Clipper2Targets${MODCMAKE_BUILD_SUFFIX}
+lib/cmake/clipper2/Clipper2Targets.cmake
+@lib lib/libClipper2.so.${LIBClipper2_VERSION}
+@lib lib/libClipper2Z.so.${LIBClipper2Z_VERSION}
+@static-lib lib/libClipper2Zutils.a
+@static-lib lib/libClipper2utils.a
+lib/pkgconfig/Clipper2.pc
+lib/pkgconfig/Clipper2Z.pc