Trouble to compile Xcompiste

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Hi~

I can't compile Xcomposite.
this is the error when a do a ./autogen --prefix=/otp/fdo.

| autoreconf-2.57: Entering directory `.'
| autoreconf-2.57: configure.ac: not using Gettext
| autoreconf-2.57: running: aclocal  --output=aclocal.m4t
| autoreconf-2.57: `aclocal.m4' is unchanged
| autoreconf-2.57: configure.ac: tracing
| autoreconf-2.57: running: libtoolize --copy
| libtoolize: `config.guess' exists: use `--force' to overwrite
| libtoolize: `config.sub' exists: use `--force' to overwrite
| libtoolize: `ltmain.sh' exists: use `--force' to overwrite
| autoreconf-2.57: running: aclocal  --output=aclocal.m4t
| autoreconf-2.57: `aclocal.m4' is unchanged
| autoreconf-2.57: running: /usr/bin/autoconf
| autoreconf-2.57: running: /usr/bin/autoheader
| autoreconf-2.57: running: automake --add-missing --copy --no-force
| autoreconf-2.57: Leaving directory `.'
| Package x11 was not found in the pkg-config search path.
| Perhaps you should add the directory containing `x11.pc'
| to the PKG_CONFIG_PATH environment variable
| No package 'x11' found
| Package compositeext was not found in the pkg-config search path.
| Perhaps you should add the directory containing `compositeext.pc'
| to the PKG_CONFIG_PATH environment variable
| No package 'compositeext' found
| configure: error: Library requirements (compositeext >= 1.0 xfixes)
not met; consider adjusting the PKG_CONFIG_PATH environment variable if
your libraries are in a nonstandard prefix so pkg-config can find them.

But my $PKG_CONFIG_PATH = /opt/fdo/pkgconfig
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