x11-misc/xearth: force gcc -E for imake's generation

Requires traditional cpp support and is broken in all sort of ways
with clang-cpp / -E. Can still use clang & friends for everything else.

Ideally these packages need to be built another way or last rited,
imake will just accumulate more problems.

Signed-off-by: Ionen Wolkens <ionen@gentoo.org>

x11-misc/xearth/xearth-1.1-r1.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -18,20 +18,23 @@ RDEPEND="
 	x11-libs/libX11
 	x11-libs/libXext
 	x11-libs/libXt"
-DEPEND="${RDEPEND}"
+DEPEND="
+	${RDEPEND}
+	x11-base/xorg-proto"
 BDEPEND="
 	app-text/rman
-	x11-base/xorg-proto
+	sys-devel/gcc
 	>=x11-misc/imake-1.0.8-r1"
 
 PATCHES=(
 	"${FILESDIR}"/${P}-include.patch
 )
+
 DOCS=( BUILT-IN GAMMA-TEST HISTORY README )
 
 src_configure() {
 	CC="$(tc-getBUILD_CC)" LD="$(tc-getLD)" \
-		IMAKECPP="${IMAKECPP:-$(tc-getCPP)}" xmkmf || die
+		IMAKECPP="${IMAKECPP:-${CHOST}-gcc -E}" xmkmf || die
 }
 
 src_compile() {