diff --git a/media-gfx/synfig/files/synfig-1.4.0-fix-cflags.patch b/media-gfx/synfig/files/synfig-1.4.0-fix-cflags.patch
new file mode 100644
index 0000000..330f31e
--- /dev/null
+++ b/media-gfx/synfig/files/synfig-1.4.0-fix-cflags.patch
@@ -0,0 +1,24 @@
+--- a/m4/subs.m4	2020-11-13 12:21:45.000000000 +0200
++++ b/m4/subs.m4	2021-03-13 19:19:48.626353955 +0200
+@@ -77,16 +77,16 @@
+ 
+ 	case "$debug" in
+ 		yes)
+-			debug_flags="-D_DEBUG -g -O0"
++			debug_flags="-D_DEBUG"
+ 			BIGOBJ_FLAGS=""
+ 			($CC --version | grep -q mingw) && BIGOBJ_FLAGS="-Wa,-mbig-obj"
+-			CXXFLAGS="`echo $CXXFLAGS | sed s:-O.::` $debug_flags -fno-inline $BIGOBJ_FLAGS"
+-			CFLAGS="`echo $CFLAGS | sed s:-O.::` $debug_flags"
++			CXXFLAGS="${CXXFLAGS} $debug_flags -fno-inline $BIGOBJ_FLAGS"
++			CFLAGS="${CFLAGS} $debug_flags"
+ 		;;
+ 		no|*)
+ 			debug_flags="-DNDEBUG"
+-			CXXFLAGS="`echo $CXXFLAGS | sed 's:-g[[a-z-]]*\s::g' | sed 's:-g[[a-z-]]*$::'` $debug_flags"
+-			CFLAGS="`echo $CFLAGS | sed 's:-g[[a-z-]]*\s::g' | sed 's:-g[[a-z-]]*$::'` $debug_flags"
++			CXXFLAGS="${CXXFLAGS} $debug_flags"
++			CFLAGS="${CFLAGS} $debug_flags"
+ 		;;
+ 	esac
+ 
diff --git a/media-gfx/synfig/synfig-1.4.0-r2.ebuild b/media-gfx/synfig/synfig-1.4.0-r2.ebuild
index 77dff87..108c587 100644
--- a/media-gfx/synfig/synfig-1.4.0-r2.ebuild
+++ b/media-gfx/synfig/synfig-1.4.0-r2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2020 Gentoo Authors
+# Copyright 1999-2021 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 #Ebuild based on the booboo overlay version
@@ -23,31 +23,34 @@ IUSE="imagemagick ffmpeg dv openexr truetype jpeg fontconfig opencl"
 DEPEND="
 	~dev-cpp/ETL-${PV}
 	>=dev-cpp/glibmm-2.4:2
-	dev-libs/boost
-	sys-libs/zlib
-	dev-libs/libsigc++:2
 	dev-cpp/libxmlpp:2.6
-	media-libs/libpng
-	media-libs/mlt
-	x11-libs/pango
-	x11-libs/cairo
+	dev-libs/boost:=
+	dev-libs/libsigc++:2
+	media-libs/libpng:=
+	media-libs/mlt:=
 	sci-libs/fftw:3.0
-	ffmpeg? ( media-video/ffmpeg )
-	openexr? ( media-libs/openexr )
-	truetype? ( media-libs/freetype )
+	sys-libs/zlib:=
+	x11-libs/cairo:=
+	x11-libs/pango:=
+	ffmpeg? ( media-video/ffmpeg:= )
 	fontconfig? ( media-libs/fontconfig )
 	jpeg? ( virtual/jpeg )
 	opencl? ( dev-libs/ocl-icd )
+	openexr? ( media-libs/openexr:= )
+	truetype? ( media-libs/freetype:= )
 	"
 RDEPEND="${DEPEND}
-	dv? ( media-libs/libdv )
-	imagemagick? ( media-gfx/imagemagick )
+	dv? ( media-libs/libdv:= )
+	imagemagick? ( media-gfx/imagemagick:= )
 	"
 
-src_prepare() {
-	eapply_user
+PATCHES=(
+	"${FILESDIR}"/${P}-fix-cflags.patch
+)
 
+src_prepare() {
 	default
+
 	eautoreconf
 }