[root@ffmpeg src]# ll //usr/local/myapps/lib/libogg.*
-rw-r--r-- 1 root root 75792 Jun 24 09:05 //usr/local/myapps/lib/libogg.a
-rwxr-xr-x 1 root root   935 Jun 24 09:05 //usr/local/myapps/lib/libogg.la
lrwxrwxrwx 1 root root    15 Jun 24 09:05 //usr/local/myapps/lib/libogg.so -> libogg.so.0.7.1
lrwxrwxrwx 1 root root    15 Jun 24 09:05 //usr/local/myapps/lib/libogg.so.0 -> libogg.so.0.7.1
-rwxr-xr-x 1 root root 58396 Jun 24 09:05 //usr/local/myapps/lib/libogg.so.0.7.1

[root@ffmpeg src]# ll /usr/local/myapps/include/ogg/*
-rw-r--r-- 1 root root  500 Jun 24 09:05 //usr/local/myapps/include/ogg/config_types.h
-rw-r--r-- 1 root root 8347 Jun 24 09:05 /usr/local/myapps/include/ogg/ogg.h
-rw-r--r-- 1 root root 4275 Jun 24 09:05 /usr/local/myapps/include/ogg/os_types.h

[root@ffmpeg /]# LDFLAGS=-L/usr/local/myapps
[root@ffmpeg /]# export  LDFLAGS
[root@ffmpeg /]# echo $LDFLAGS
-L/usr/local/myapps

checking for OGG... no
checking for Ogg... no
*** Could not run Ogg test program, checking why...
*** The test program failed to compile or link. See the file config.log for the
*** exact error that occured. This usually means Ogg was incorrectly installed
*** or that you have moved Ogg since it was installed.
configure: error: must have Ogg installed!

[root@ffmpeg  / ]# cat  //usr/local/myapps/lib/pkgconfig/ogg.pc
# ogg pkg-config file

prefix=/usr/local/myapps
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: ogg
Description: ogg is a library for manipulating ogg bitstreams
Version: 1.2.2
Requires:
Conflicts:
Libs: -L${libdir} -logg
Cflags: -I${includedir}

[root@ffmpeg /]# PKG_CONFIG_PATH=/usr/local/myapps/lib/pkgconfig
[root@ffmpeg /]# export PKG_CONFIG_PATH