Install vitasdk
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=Release ..
make && make install
Like on any POSIX platform - include dlfcn.h
Link with -ldl -ltaihen_stub -lSceKernelModulemgr_stub -lSceSblSsMgr_stub
Build your suprx without custom NIDs and use dlopen to load it.
libdl uses sha256 for NID generation, because vitasdk uses it, with fallback to sha1 if sha256 NID isn't found.