building X from source: freetype install issues

[mike young]

Attempting to build X on Debian Buster install. Downloaded and built 
freetype from freetype.org before building X. When running build.sh, 
getting error:

...

checking pkg-config is at least version 0.9.0... yes
checking for FREETYPE... no
checking for freetype-config... no
configure: error: You must have freetype installed; see 
http://www.freetype.org/
build.sh: "./autogen.sh" failed on lib/libXfont

...


Evidently building freetype is not sufficient for building X. Any hints 
as to what I have neglected to do?

Thanks...