Building PikoPixel 1.0 BETA9d from source requires a GNUstep development environment with either of the supported compiler/runtime setups (GCC/gobjc or clang/objc2), and the following GS library versions (or later):
GNUstep Base: v1.24.9
GNUstep GUI & Back: v0.25.0
PikoPixel is distributed under the GNU Affero General Public License, version 3 (AGPLv3).