set CPPFLAGS/LDFLAGS to consistently pick up headers and libraries on

gcc and clang archs. add dep on fftw.

fixes a build problem on ports-gcc archs where the default library path
includes /usr/local/lib/gcc/ARCH-unknown-openbsd/15.2.0/../../.., a.k.a.
/usr/local/lib, but the default include search path for system headers
just has /usr/local/lib/gcc/x86_64-unknown-openbsd/15.2.0/include{,-fixed}
and /usr/include (so the library is picked up, but headers are not).

ok claudio@

cad/ngspice/Makefile.inc

@@ -29,3 +29,6 @@ CONFIGURE_ARGS +=	--enable-cider \
 			--with-readline=yes
 
 CONFIGURE_ARGS +=	--disable-openmp
+
+CONFIGURE_ENV =		CPPFLAGS=-I${LOCALBASE}/include \
+			LDFLAGS=-L${LOCALBASE}/lib

cad/ngspice/libngspice/Makefile

@@ -1,15 +1,17 @@
 COMMENT =	ngspice shared library, based on Berkeley SPICE
 
 PKGNAME =	libngspice-${V}
-REVISION =	0
+REVISION =	1
 
 SHARED_LIBS +=  ngspice                0.0 # 0.0
 
-WANTLIB += ${COMPILER_LIBCXX} m pthread
+WANTLIB += ${COMPILER_LIBCXX} fftw3 m pthread
 
 CONFIGURE_ARGS +=	--with-ngshared \
 			--enable-shared
 
+LIB_DEPENDS =	math/fftw3
+
 # same tests as cad/ngspice/ngspice, but they assume you've built a binary
 NO_TEST =	Yes
 

cad/ngspice/ngspice/Makefile

@@ -1,9 +1,13 @@
+REVISION =	0
+
 COMMENT =	circuit simulator, based on Berkeley SPICE
 
 WANTLIB += ${COMPILER_LIBCXX} ICE SM X11 Xau Xaw Xdmcp Xext Xft
-WANTLIB += Xmu Xpm Xrender Xt c curses expat fontconfig freetype
-WANTLIB += m readline xcb z
+WANTLIB += Xmu Xpm Xrender Xt c curses expat fftw3 fontconfig
+WANTLIB += freetype m readline xcb z
 
 CONFIGURE_ARGS +=	--with-x
 
+LIB_DEPENDS =	math/fftw3
+
 .include <bsd.port.mk>