diff --git a/media-gfx/gmic/gmic-2.9.9.recipe b/media-gfx/gmic/gmic-2.9.9.recipe
index a23432a6c..bfdb26954 100644
--- a/media-gfx/gmic/gmic-2.9.9.recipe
+++ b/media-gfx/gmic/gmic-2.9.9.recipe
@@ -8,7 +8,7 @@ volumetric images, hence including 2D color images."
 HOMEPAGE="https://gmic.eu"
 COPYRIGHT="Sébastien Fourey"
 LICENSE="GNU GPL v3"
-REVISION="5"
+REVISION="6"
 SOURCE_URI="https://gmic.eu/files/source/gmic_$portVersion.tar.gz"
 CHECKSUM_SHA256="9f053338752ec96a6b619718037767682c5fd58e2471c08f3740fdb070605bc0"
 SOURCE_DIR="gmic-$portVersion"
@@ -100,9 +100,15 @@ BUILD()
 {
 	export DISABLE_ASLR=1
 
+	local CUSTOM_CXX_FLAGS="-O3"
+	if [ "$targetArchitecture" = x86_gcc2 ]; then
+		CUSTOM_CXX_FLAGS="-O0"
+	fi
+
 	cmake $cmakeDirArgs \
 		-B build -S . \
-		-DCMAKE_CXX_FLAGS="-O3" \
+		-DCMAKE_BUILD_TYPE=Release \
+		-DCMAKE_CXX_FLAGS=$CUSTOM_CXX_FLAGS \
 		-DCUSTOM_CFLAGS=ON \
 		-DBUILD_BASH_COMPLETION=OFF \
 		-DBUILD_CLI=OFF \
@@ -122,12 +128,15 @@ BUILD()
 		-DENABLE_ZLIB=ON \
 		-DENABLE_LTO=OFF
 
-	cmake --build build -j1
+	cd build
+	make
+	cd ..
 
 	export LDFLAGS="$LDFLAGS -L../build"
 
 	cmake -B build-qt -S ./gmic-qt \
-		-DCMAKE_CXX_FLAGS="-O3" \
+		-DCMAKE_BUILD_TYPE=Release \
+		-DCMAKE_CXX_FLAGS=$CUSTOM_CXX_FLAGS \
 		-DCUSTOM_CFLAGS=ON \
 		-DGMIC_PATH=$sourceDir/src \
 		-DGMIC_QT_HOST=none \
@@ -137,12 +146,15 @@ BUILD()
 		-DENABLE_FFTW3=ON \
 		-DENABLE_LTO=OFF
 
-	cmake --build build-qt -j1
+	cd build-qt
+	make
 }
 
 INSTALL()
 {
-	cmake --install build
+	cd build
+	make install
+	cd ..
 
 	mkdir -p "$appsDir/G'MIC"
 	cp build-qt/gmic_qt "$appsDir/G'MIC/G'MIC"