I get this when compiling 2.0.48 via gentoo's ebuild:
/bin/sh /portage/apache-2.0.48/work/httpd-2.0.48/srclib/apr/libtool \
--silent --mode=compile gcc -pthread -march=pentium3 -O2 -pipe -DHAVE_CONFIG_H \
-DLINUX=2 -D_REENTRANT -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -D_SVID_SOURCE
-D_GNU_SOURCE
I figured this out shortly after posting ... :(
What is happening is that something in the latest glibc or kernel
headers (not linked into /usr/include, but glibc was built against
the 2.6 kernel and probably grabbed some headers then) convinces apr
that sctp is supported, even when the lksctp
