Index: asymptote-2.13/configure.ac
===================================================================
--- asymptote-2.13.orig/configure.ac
+++ asymptote-2.13/configure.ac
@@ -150,7 +150,7 @@ if test "x$ac_cv_use_gc" != "xno" ; then
       fi
       CPPFLAGS_SAVE=$CPPFLAGS
       CPPFLAGS=$CPPFLAGS" $INCL"
-      AC_CHECK_HEADER(gc.h,
+      AC_CHECK_HEADER([gc/gc.h],
 	AC_CHECK_LIB([gc],[GC_malloc],[
 	  LIBS=$LIBS"-lgc "
 	  AC_MSG_NOTICE([enabling system $GCNAME])],[
@@ -223,7 +223,17 @@ AC_MSG_ERROR([*** Please install libm on
 AC_CHECK_LIB([z], [deflate],,
 AC_MSG_ERROR([*** Please install libz on your system ***]))
 AC_CHECK_LIB([pthread], [pthread_create])
-AC_CHECK_LIB([sigsegv], [stackoverflow_install_handler])
+
+AC_ARG_WITH(sigsegv,
+           [  --with-sigsegv          use libsigsegv],
+           [with_sigsegv=$withval],
+           [with_sigsegv="no"])
+if test "$with_sigsegv" = "yes"; then
+AC_CHECK_HEADER([sigsegv.h],
+   AC_CHECK_LIB([sigsegv], [stackoverflow_install_handler]),
+   AC_MSG_NOTICE([*** Header file sigsegv.h not found ***]))
+fi
+
 AC_CHECK_LIB([rt], [sched_yield])
 
 AC_ARG_ENABLE(readline,