Change:
<ins> { stdenv , fetchFromGitHub , bison , git , python2 , rake , ruby , libGL , libuv , libX11 }: let mgem-list = fetchFromGitHub { owner = "mruby"; repo = "mgem-list"; rev = "2033837203c8a141b1f9d23bb781fe0cbaefbd24"; sha256 = "0igf2nsx5i6g0yf7sjxxkngyriv213d0sjs3yidrflrabiywpxmm"; }; mruby-dir = fetchFromGitHub { owner = "iij"; repo = "mruby-dir"; rev = "89dceefa1250fb1ae868d4cb52498e9e24293cd1"; sha256 = "0zrhiy9wmwmc9ls62iyb2z86j2ijqfn7rn4xfmrbrfxygczarsm9"; }; mruby-errno = fetchFromGitHub { owner = "iij"; repo = "mruby-errno"; rev = "b4415207ff6ea62360619c89a1cff83259dc4db0"; sha256 = "12djcwjjw0fygai5kssxbfs3pzh3cpnq07h9m2h5b51jziw380xj"; }; mruby-file-stat = fetchFromGitHub { owner = "ksss"; repo = "mruby-file-stat"; rev = "aa474589f065c71d9e39ab8ba976f3bea6f9aac2"; sha256 = "1clarmr67z133ivkbwla1a42wcjgj638j9w0mlv5n21mhim9rid5"; }; mruby-process = fetchFromGitHub { owner = "iij"; repo = "mruby-process"; rev = "fe171fbe2a6cc3c2cf7d713641bddde71024f7c8"; sha256 = "00yrzc371f90gl5m1gbkw0qq8c394bpifssjr8p1wh5fmzhxqyml"; }; mruby-pack = fetchFromGitHub { owner = "iij"; repo = "mruby-pack"; rev = "383a9c79e191d524a9a2b4107cc5043ecbf6190b"; sha256 = "003glxgxifk4ixl12sy4gn9bhwvgb79b4wga549ic79isgv81w2d"; }; in stdenv.mkDerivation rec { pname = "mruby-zest"; version = "3.0.5"; src = fetchFromGitHub { owner = pname; repo = "${pname}-build"; rev = version; sha256 = "0fxljrgamgz2rm85mclixs00b0f2yf109jc369039n1vf0l5m57d"; fetchSubmodules = true; }; nativeBuildInputs = [ bison git python2 rake ruby ]; buildInputs = [ libGL libuv libX11 ]; patches = [ ./force-gcc-as-linker.patch ./system-libuv.patch ]; # Add missing dependencies of deps/mruby-dir-glob/mrbgem.rake # Should be fixed in next release, see bcadb0a5490bd6d599f1a0e66ce09b46363c9dae postPatch = '' mkdir -p mruby/build/mrbgems ln -s ${mgem-list} mruby/build/mrbgems/mgem-list ln -s ${mruby-dir} mruby/build/mrbgems/mruby-dir ln -s ${mruby-errno} mruby/build/mrbgems/mruby-errno ln -s ${mruby-file-stat} mruby/build/mrbgems/mruby-file-stat ln -s ${mruby-process} mruby/build/mrbgems/mruby-process ln -s ${mruby-pack} mruby/build/mrbgems/mruby-pack ''; installTargets = [ "pack" ]; postInstall = '' ln -s "$out/zest" "$out/zyn-fusion" cp -a package/{font,libzest.so,schema,zest} "$out" # mruby-widget-lib/src/api.c requires MainWindow.qml as part of a # sanity check, even though qml files are compiled into the binary # https://github.com/mruby-zest/mruby-zest-build/tree/3.0.5/src/mruby-widget-lib/src/api.c#L99-L116 # https://github.com/mruby-zest/mruby-zest-build/tree/3.0.5/linux-pack.sh#L17-L18 mkdir -p "$out/qml" touch "$out/qml/MainWindow.qml" ''; meta = with stdenv.lib; { description = "The Zest Framework used in ZynAddSubFX's UI"; homepage = "https://github.com/mruby-zest"; license = licenses.lgpl21; maintainers = with maintainers; [ metadark ]; platforms = platforms.all; }; } </ins>

Discussion:
Project description ! Zyn-Fusion is the new GUI front-end for . I tried to modify zynaddsubfx to use the package from (which is said to have included zyn-fusion) with no avail. Metadata homepage URL: source URL: license: platforms: linux cc zynaddsubfx maintainers
I marked this as stale due to inactivity. &rarr;