tce-load -i compiletc libXmu-dev

cd xset-1.2.4

CC="gcc -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe" CXX="g++ -flto -fuse-linker-plugin -march=i486 -mtune=i686 -Os -pipe -fno-exceptions -fno-rtti" ./configure --prefix=/usr/local --localstatedir=/var --sysconfdir=/etc

find . -name Makefile -type f -exec sed -i 's/-g -O2//g' {} \;

make
sudo make install

Perhaps you should add the directory containing `xxf86misc.pc'
Perhaps you should add the directory containing `xfontcache.pc'