librsvg won't build

[M-Rick]

I am trying to build ports that depend on librsvg. I always get the same error.

info:build gi-docgen generate -C ./librsvg.toml --content-dir=../doc ../Rsvg-2.0.gir
:info:build ERROR: Could not find GIR dependency in the search paths: GLib-2.0
:info:build INFO: Loading config file: ./librsvg.toml
:info:build INFO: Theme name: Basic
:info:build INFO: Output directory: librsvg/work/librsvg-2.54.4/doc
:info:build INFO: Parsing GIR file
:info:build make[2]: *** [build.stamp] Error 1
:info:build make[2]: Leaving directory `librsvg/work/librsvg-2.54.4/doc'
:info:build make[1]: *** [all-recursive] Error 1
:info:build make[1]: Leaving directory `librsvg/work/librsvg-2.54.4'
:info:build make: *** [all] Error 2
:info:build make: Leaving directory `librsvg/work/librsvg-2.54.4'
:info:build Command failed:  cd "librsvg/work/librsvg-2.54.4" && /usr/bin/make -j4 -w all CFLAGS=" -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk -arch x86_64" LDFLAGS="-lobjc -Wl,-syslibroot,/Library/Developer/CommandLineTools/SDKs/MacOSX11.sdk -arch x86_64" 
:info:build Exit code: 2