sci-mathematics/chaco: fix CC

Closes: https://bugs.gentoo.org/785166
Signed-off-by: Anna Vyalkova <cyber@sysrq.in>

sci-mathematics/chaco/chaco-2.2.ebuild

@@ -1,7 +1,9 @@
 # Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
-EAPI="7"
+EAPI=7
+
+inherit toolchain-funcs
 
 DESCRIPTION="Software for Partitioning Graphs"
 HOMEPAGE="https://www3.cs.stonybrook.edu/~algorith/implement/chaco/implement.shtml"
@@ -13,10 +15,13 @@ KEYWORDS="~amd64 ~x86"
 PATCHES=( "${FILESDIR}/makefile.patch" )
 S="${WORKDIR}/Chaco-${PV}"
 
+src_compile() {
+	cd code || die
+	tc-export CC
+	default
+}
+
 src_install() {
-	pushd code || die
-	emake
-	popd || die
 	dobin "exec/chaco"
 	dodoc -r doc/.
 }