pangocairo header files not installed

I am running Ubuntu 20.04 on WSL 2. I installed libpangocairo, but I can't find any of its header files.

I should have pangocairo installed:

$ apt list --installed|grep pangoWARNING: apt does not have a stable CLI interface. Use with caution in scripts.libpango-1.0-0/focal,now 1.44.7-2ubuntu4 amd64 [installed]libpango-perl/focal,now 1.227-3build1 amd64 [installed]libpangocairo-1.0-0/focal,now 1.44.7-2ubuntu4 amd64 [installed,automatic]libpangoft2-1.0-0/focal,now 1.44.7-2ubuntu4 amd64 [installed,automatic]

But none of the header files exist:

$ find . -path ./mnt -prune -o -print |grep pango./usr/lib/x86_64-linux-gnu/libpango-1.0.so.0.4400.7./usr/lib/x86_64-linux-gnu/libpangocairo-1.0.so.0.4400.7./usr/lib/x86_64-linux-gnu/libpangoft2-1.0.so.0./usr/lib/x86_64-linux-gnu/libpangocairo-1.0.so.0./usr/lib/x86_64-linux-gnu/libpangoft2-1.0.so.0.4400.7./usr/lib/x86_64-linux-gnu/perl5/5.30/Pango/Install/pango-perl.typemap./usr/lib/x86_64-linux-gnu/perl5/5.30/Pango/Install/pango-perl.h./usr/lib/x86_64-linux-gnu/perl5/5.30/Pango/Install/pango-perl-autogen.h./usr/lib/x86_64-linux-gnu/perl5/5.30/Pango/Install/pango-perl-versions.h./usr/lib/x86_64-linux-gnu/perl5/5.30/Pango/Install/pango.typemap./usr/lib/x86_64-linux-gnu/libpango-1.0.so.0./usr/share/doc/libpangocairo-1.0-0./usr/share/doc/libpangocairo-1.0-0/changelog.Debian.gz./usr/share/doc/libpangocairo-1.0-0/copyright./usr/share/doc/libpango-1.0-0./usr/share/doc/libpango-1.0-0/NEWS.gz./usr/share/doc/libpango-1.0-0/README.md./usr/share/doc/libpango-1.0-0/THANKS./usr/share/doc/libpango-1.0-0/changelog.Debian.gz./usr/share/doc/libpango-1.0-0/copyright./usr/share/doc/libpango-perl./usr/share/doc/libpango-perl/changelog.Debian.gz./usr/share/doc/libpango-perl/examples./usr/share/doc/libpango-perl/examples/cairo-simple.pl./usr/share/doc/libpango-perl/copyright./usr/share/doc/libpangoft2-1.0-0./usr/share/doc/libpangoft2-1.0-0/changelog.Debian.gz./usr/share/doc/libpangoft2-1.0-0/copyright./var/lib/dpkg/info/libpangocairo-1.0-0:amd64.md5sums./var/lib/dpkg/info/libpangoft2-1.0-0:amd64.triggers./var/lib/dpkg/info/libpango-1.0-0:amd64.symbols./var/lib/dpkg/info/libpangocairo-1.0-0:amd64.symbols./var/lib/dpkg/info/libpangocairo-1.0-0:amd64.list./var/lib/dpkg/info/libpango-1.0-0:amd64.triggers./var/lib/dpkg/info/libpangoft2-1.0-0:amd64.symbols./var/lib/dpkg/info/libpangocairo-1.0-0:amd64.shlibs./var/lib/dpkg/info/libpango-perl.list./var/lib/dpkg/info/libpango-1.0-0:amd64.md5sums./var/lib/dpkg/info/libpangoft2-1.0-0:amd64.list./var/lib/dpkg/info/libpango-perl.md5sums./var/lib/dpkg/info/libpango-1.0-0:amd64.shlibs./var/lib/dpkg/info/libpangoft2-1.0-0:amd64.md5sums./var/lib/dpkg/info/libpango-1.0-0:amd64.list./var/lib/dpkg/info/libpangocairo-1.0-0:amd64.triggers./var/lib/dpkg/info/libpangoft2-1.0-0:amd64.shlibs./var/cache/apt/archives/libpango-perl_1.227-3build1_amd64.deb./var/cache/apt/archives/libpangoft2-1.0-0_1.44.7-2ubuntu4_amd64.deb

pkg-config returns nothing:

$ pkg-config --cflags --libs pangocairoPackage pangocairo was not found in the pkg-config search path.Perhaps you should add the directory containing `pangocairo.pc'to the PKG_CONFIG_PATH environment variableNo package 'pangocairo' found