sci-libs/chaco: respect flags

Closes: https://bugs.gentoo.org/781638
Package-Manager: Portage-3.0.18, Repoman-3.0.3
Signed-off-by: Alessandro Barbieri <lssndrbarbieri@gmail.com>

sci-libs/chaco/chaco-2.2.ebuild

@@ -1,10 +1,8 @@
-# Copyright 1999-2020 Gentoo Authors
+# Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI="7"
 
-inherit flag-o-matic
-
 DESCRIPTION="Software for Partitioning Graphs"
 HOMEPAGE="https://www3.cs.stonybrook.edu/~algorith/implement/chaco/implement.shtml"
 SRC_URI="https://www3.cs.stonybrook.edu/~algorith/implement/${PN}/distrib/Chaco-${PV}.tar.gz"
@@ -12,21 +10,17 @@ SRC_URI="https://www3.cs.stonybrook.edu/~algorith/implement/${PN}/distrib/Chaco-
 LICENSE="LGPL-2.1"
 SLOT="0"
 KEYWORDS="~amd64 ~x86"
-
+PATCHES=( "${FILESDIR}/makefile.patch" )
 S="${WORKDIR}/Chaco-${PV}"
 
-src_prepare() {
-	sed -i '/CC =/d' code/Makefile
-	sed -i '/CFLAGS =/d' code/Makefile
-	sed -i -e 's/-O2/${CFLAGS}/g' code/Makefile
-	eapply_user
-}
+#src_prepare() {
+#	eapply_user
+#}
 
 src_install() {
-	append-cflags -fPIE
-	cd code
+	pushd code
 	emake
-	cd ..
+	popd
 	dobin "exec/chaco"
 	dodoc -r doc/.
 }

sci-libs/chaco/files/makefile.patch

@@ -0,0 +1,26 @@
+--- a/code/Makefile	2021-04-12 01:42:10.792372462 +0200
++++ b/code/Makefile	2021-04-12 01:46:20.332391138 +0200
+@@ -1,8 +1,6 @@
+ DEST_DIR = 	../exec
+ DEST=		${DEST_DIR}/chaco
+-CC = 		gcc
+ IFLAG =		-Imain
+-CFLAGS =	-O2
+ OFLAGS =	-O2
+ 
+ FILES.c=	main/user_params.c main/interface.c main/main.c \
+@@ -91,7 +89,7 @@
+ 
+ 
+ ${DEST}:	${FILES.o} Makefile
+-		${CC} ${OFLAGS} ${FILES.o} -lm -o ${DEST}
++		${CC} ${CFLAGS} -fPIE ${LDFLAGS} ${FILES.o} -lm -o ${DEST}
+ 
+ lint:
+ 		lint ${IFLAG} ${FILES.c} -lm
+@@ -103,4 +101,4 @@
+ 		rm -f */*.o ${DEST_DIR}/core
+ 
+ .c.o:
+-		${CC} -c ${IFLAG} ${CFLAGS} -o $*.o $*.c
++		${CC} -c ${IFLAG} ${CFLAGS} -fPIC -o $*.o $*.c