games-puzzle/rezerwar: fix build with gcc10

Use correct compiler and fix build on prefix

Closes: https://bugs.gentoo.org/708238
Package-Manager: Portage-3.0.4, Repoman-3.0.1
Signed-off-by: Alexey Sokolov <alexey+gentoo@asokolov.org>
Signed-off-by: David Seifert <soap@gentoo.org>

games-puzzle/rezerwar/files/rezerwar-0.4.2-gcc-CC.patch

@@ -0,0 +1,12 @@
+diff -r 4e0421547ae0 configure
+--- a/configure	Sat Oct 03 14:28:50 2020 +0000
++++ b/configure	Sat Oct 03 14:41:42 2020 +0000
+@@ -58,7 +58,7 @@
+ }
+ EOF
+ 
+-	if ! gcc `sdl-config --cflags` test_sdl_mixer.c -o test_sdl_mixer; then
++	if ! $CC `sdl-config --cflags` test_sdl_mixer.c -o test_sdl_mixer; then
+ 		echo "SDL_mixer not found =/"
+ 		rm -f test_sdl_mixer*
+ 		exit

games-puzzle/rezerwar/files/rezerwar-0.4.2-gcc10.patch

@@ -0,0 +1,12 @@
+diff -r 3f22f3a0051b src/events.c
+--- a/src/events.c	Sat Oct 03 14:42:28 2020 +0000
++++ b/src/events.c	Sat Oct 03 14:42:42 2020 +0000
+@@ -38,7 +38,7 @@
+ 
+ extern Board *board;
+ extern Configuration *conf;
+-SDL_Surface *screen;
++extern SDL_Surface *screen;
+ Cube *speedy;			// currently accelerated cube
+ 
+ 

games-puzzle/rezerwar/rezerwar-0.4.2-r2.ebuild

@@ -0,0 +1,58 @@
+# Copyright 1999-2020 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=7
+
+inherit desktop toolchain-funcs
+
+DESCRIPTION="Puzzle game like the known tetromino and the average pipe games"
+HOMEPAGE="https://tamentis.com/projects/rezerwar/"
+SRC_URI="https://tamentis.com/projects/rezerwar/files/${P}.tar.gz"
+
+LICENSE="BSD"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+
+DEPEND="
+	media-libs/libsdl[sound,joystick,video]
+	media-libs/sdl-mixer[vorbis]"
+RDEPEND="${DEPEND}"
+
+PATCHES=(
+	"${FILESDIR}"/${P}-gcc-CC.patch
+	"${FILESDIR}"/${P}-gcc10.patch
+)
+
+src_prepare() {
+	default
+	sed -i \
+		-e '/check_sdl$/d' \
+		-e 's/-O2 //' \
+		configure \
+		|| die 'sed failed'
+	sed -i \
+		-e '/CC.*OBJECTS/s:$(CC):$(CC) $(LDFLAGS):' \
+		mkfiles/Makefile.src \
+		|| die "sed failed"
+}
+
+src_configure() {
+	tc-export CC
+
+	SDLCONFIG=sdl-config \
+	TARGET_BIN="${EPREFIX}/usr/bin" \
+	TARGET_DOC="${EPREFIX}/usr/share/doc/${PF}" \
+	TARGET_DATA="${EPREFIX}/usr/share/${PN}" \
+		./configure || die "configure failed"
+	sed -i \
+		-e '/TARGET_DOC/d' \
+		Makefile \
+		|| die "sed failed"
+}
+
+src_install() {
+	dodir /usr/bin
+	default
+	dodoc doc/{CHANGES,README,TODO}
+	make_desktop_entry rezerwar Rezerwar
+}