remove -fPIC from CFLAGS. added comments for SRC/PKGDEST

abuild.conf

 export CHOST=i486-alpine-linux-uclibc
-export CFLAGS="-march=i486 -Os -fPIC -fomit-frame-pointer"
+export CFLAGS="-march=i486 -Os -fomit-frame-pointer"
 export CXXFLAGS="$CFLAGS"
 export CPPFLAGS="$CFLAGS"
+export LDFLAGS="-Wl,--as-needed"
 
 export PATH=:/usr/i386-gentoo-linux-uclibc/binutils-bin/2.18:$PATH
 
@@ -9,3 +10,9 @@ export MAKEFLAGS=-j2
 
 # remove line below to disable colors
 USE_COLORS=1
+
+# uncomment line below to fetch sources to other location location
+#SRCDEST=/var/cache/distfiles
+
+# uncomment line below to store built packages in other location
+#PKGDEST=/var/lib/packages