building Mapserver on Gentoo: with-proj doesn't see files

[Jeff Kowalczyk]

I'm trying to build mapserver on Gentoo linux, in preparation to attempt
an ebuild installation package for it. I have dev-libs/proj-4.4.8
installed, which I presume is the dependency for with-proj.

I need information on the expectation of the with-proj argument:

./configure --with-proj=/usr/lib
configure: checking whether we should include PROJ.4 support......
configure: error: "Could not find projects.h or libproj.a/libproj.so in
/usr/lib."

Same result for /usr/bin, /usr/share/proj, etc. Its almost like the make
file doesn't see any of those files, but they are present. Any
suggestions?

Here is the Gentoo file manifest for an installed proj-4.4.8:

# qpkg -l proj
dev-libs/proj-4.4.8 *
CONTENTS:
/usr
/usr/bin
/usr/bin/geod
/usr/bin/proj
/usr/bin/cs2cs
/usr/bin/nad2bin
/usr/bin/nad2nad
/usr/bin/invgeod -> geod
/usr/bin/invproj -> proj
/usr/lib
/usr/lib/libproj.so.0.4.2
/usr/lib/libproj.a
/usr/lib/libproj.la
/usr/lib/libproj.so -> libproj.so.0.4.2 /usr/share
/usr/share/doc
/usr/share/doc/proj-4.4.8
/usr/share/doc/proj-4.4.8/README.NADUS.gz
/usr/share/doc/proj-4.4.8/README.gz
/usr/share/doc/proj-4.4.8/NEWS.gz
/usr/share/doc/proj-4.4.8/INSTALL.gz
/usr/share/doc/proj-4.4.8/AUTHORS.gz
/usr/share/doc/proj-4.4.8/README.NAD.gz
/usr/share/doc/proj-4.4.8/ChangeLog.gz /usr/share/man
/usr/share/man/man1
/usr/share/man/man1/cs2cs.1.gz
/usr/share/man/man1/geod.1.gz
/usr/share/man/man1/proj.1.gz
/usr/share/man/man1/nad2nad.1.gz
/usr/share/man/man3
/usr/share/man/man3/pj_init.3.gz
/usr/share/proj
/usr/share/proj/FL
/usr/share/proj/MD
/usr/share/proj/TN
/usr/share/proj/WI
/usr/share/proj/WO
/usr/share/proj/GL27
/usr/share/proj/epsg
/usr/share/proj/esri
/usr/share/proj/prvi
/usr/share/proj/proj_def.dat
/usr/share/proj/conus
/usr/share/proj/nad27
/usr/share/proj/nad83
/usr/share/proj/world
/usr/share/proj/pj_out83.dist
/usr/share/proj/alaska
/usr/share/proj/nad.lst
/usr/share/proj/hawaii
/usr/share/proj/pj_out27.dist
/usr/share/proj/test27
/usr/share/proj/test83
/usr/share/proj/stlrnc
/usr/share/proj/stpaul
/usr/share/proj/stgeorge
/usr/share/proj/ntv1_can.dat
/usr/include
/usr/include/nad_list.h
/usr/include/proj_api.h
/usr/include/projects.h
/usr/lib/libproj.so.0 -> libproj.so.0.4.2