Slackware Linux: Glib can't find libffi.so.6. Where is it trying to look?-Collection of common programming errors

I have libffi installed and it’s in /usr/local/lib, yet the glib make process can’t find it

/home/mathmagi/src/glib-2.32.4/gio/.libs/lt-glib-compile-resources: error while loading shared libraries: libffi.so.6: cannot open shared object file: No such file or directory
/home/mathmagi/src/glib-2.32.4/gio/.libs/lt-glib-compile-resources: error while loading shared libraries: libffi.so.6: cannot open shared object file: No such file or directory
/home/mathmagi/src/glib-2.32.4/gio/.libs/lt-glib-compile-resources: error while loading shared libraries: libffi.so.6: cannot open shared object file: No such file or directory
/home/mathmagi/src/glib-2.32.4/gio/.libs/lt-glib-compile-resources: error while loading shared libraries: libffi.so.6: cannot open shared object file: No such file or directory
make[4]: Entering directory `/home/mathmagi/src/glib-2.32.4/gio/tests'
  GEN    gdbus-test-codegen-generated.c
  GEN    test_resources.c
/home/mathmagi/src/glib-2.32.4/gio/.libs/lt-glib-compile-resources: error while loading shared libraries: libffi.so.6: cannot open shared object file: No such file or directory
make[4]: *** [test_resources.c] Error 127
make[4]: Leaving directory `/home/mathmagi/src/glib-2.32.4/gio/tests'
make[3]: *** [all-recursive] Error 1
make[3]: Leaving directory `/home/mathmagi/src/glib-2.32.4/gio'
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/mathmagi/src/glib-2.32.4/gio'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/mathmagi/src/glib-2.32.4'
make: *** [all] Error 2

It’s definitely in /usr/local/lib!

bash-4.1# updatedb
bash-4.1# locate libffi.so.6
/usr/local/lib/libffi.so.6
/usr/local/lib/libffi.so.6.0.0
/home/mathmagi/src/libffi-3.0.11/x86_64-unknown-linux-gnu/.libs/libffi.so.6
/home/mathmagi/src/libffi-3.0.11/x86_64-unknown-linux-gnu/.libs/libffi.so.6.0.0

With glib I’ve tried

LDFLAGS=-L/usr/local/lib ./configure

Doesn’t work.

How do I find where glib is looking and change it?

Originally posted 2013-11-10 00:10:33.