diff -ur work.orig/sablevm-1.0.2/configure.ac work/sablevm-1.0.2/configure.ac
--- work.orig/sablevm-1.0.2/configure.ac	Wed Aug 14 22:29:54 2002
+++ work/sablevm-1.0.2/configure.ac	Thu Aug 15 14:54:29 2002
@@ -114,12 +114,15 @@
 AC_LIBTOOL_DLOPEN
 AM_PROG_LIBTOOL
 
+dnl Required FreeBSD compile flags
+test "x$prefix" = xNONE && prefix=$ac_default_prefix
+CFLAGS="${CFLAGS} -D_P1003_1B_VISIBLE -pthread -I${prefix}/include -L${prefix}/lib"
+
 dnl Checks for libraries.
 AC_CHECK_LIB(ffi,ffi_prep_cif,echo -n,echo ***ERROR: libffi is missing; exit 1)
 AC_CHECK_LIB(ltdl,lt_dlinit,echo -n,echo ***ERROR: libltdl is missing; exit 1)
 AC_CHECK_LIB(m,fmod,echo -n,echo ***ERROR: libm is missing; exit 1)
 AC_CHECK_LIB(popt,poptGetContext,echo -n,echo ***ERROR: libpopt is missing; exit 1)
-AC_CHECK_LIB(pthread,pthread_self,echo -n,echo ***ERROR: libpthread is missing; exit 1)
 
 dnl Checks for header files.
 AC_HEADER_STDC