Align header install path

For this release we will still dump our header to `<prefix>/include`.

Signed-off-by: Steffen Jaeckel <s@jaeckel.eu>

CMakeLists.txt

@@ -164,7 +164,7 @@ install(TARGETS ${PROJECT_NAME}
     LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
     ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT Libraries
     RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
-    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}/${PROJECT_NAME}
+    PUBLIC_HEADER DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
 )
 
 # Install libtommath.pc for pkg-config if we build a shared library

libtommath.pc.in

@@ -1,10 +1,9 @@
-prefix=@to-be-replaced@
-exec_prefix=${prefix}
-libdir=${exec_prefix}/lib
-includedir=${prefix}/include
+prefix=@CMAKE_INSTALL_PREFIX@
+libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
+includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: LibTomMath
 Description: public domain library for manipulating large integer numbers
-Version: @to-be-replaced@
+Version: @PROJECT_VERSION@
 Libs: -L${libdir} -ltommath
 Cflags: -I${includedir}

makefile.shared

@@ -70,7 +70,8 @@ install: $(LIBNAME)
 	install -d $(DESTDIR)$(INCPATH)
 	$(LIBTOOL) --mode=install install -m 644 $(LIBNAME) $(DESTDIR)$(LIBPATH)/$(LIBNAME)
 	install -m 644 $(HEADERS_PUB) $(DESTDIR)$(INCPATH)
-	sed -e 's,^prefix=.*,prefix=$(PREFIX),' -e 's,^Version:.*,Version: $(VERSION_PC),' libtommath.pc.in > libtommath.pc
+	sed -e 's,^prefix=.*,prefix=$(PREFIX),' -e 's,^Version:.*,Version: $(VERSION_PC),' -e 's,@CMAKE_INSTALL_LIBDIR@,lib,' \
+		-e 's,@CMAKE_INSTALL_INCLUDEDIR@,include,' libtommath.pc.in > libtommath.pc
 	install -d $(DESTDIR)$(LIBPATH)/pkgconfig
 	install -m 644 libtommath.pc $(DESTDIR)$(LIBPATH)/pkgconfig/