[root@moo /usr/local/src/subversion-1.6.1]# make
------ making all in apr
------ completed all in apr
------ making all in apr-util
------ completed all in apr-util
------ making all in neon
------ completed all in neon
------ making all in serf
/usr/local/src/subversion-1.6.1/apr/libtool --silent --mode=link gcc -L/usr/local/lib -static -o test/serf_get  /usr/local/src/subversion-1.6.1/apr-util/libaprutil-1.la  -lexpat  /usr/local/src/subversion-1.6.1/apr/libapr-1.la -lcrypt  -lpthread  -lz -lssl -lcrypto
/usr/bin/ld: warning: libcrypto.so.5, needed by /usr/lib/libssl.so, may conflict with libcrypto.so.0.9.8
/usr/lib/crt1.o(.text+0x88): In function `_start':
: undefined reference to `main'
*** Error code 1

Stop in /usr/local/src/subversion-1.6.1/serf.