diff --git a/Makefile.in b/Makefile.in
index 1faefbab..4ad2d6bb 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,6 +1,7 @@
 RUSTC := rustc
 BUILDDIR := build
-RUSTFLAGS := -O --cfg ndebug
+RUSTCFGS := %RUSTCFGS%
+RUSTFLAGS := -O --cfg ndebug $(RUSTCFGS)
 INSTALL_DIR := %PREFIX%
 
 OPENSSL_LIB := lib.rs
@@ -29,7 +30,7 @@ clean:
 	rm -rf $(BUILDDIR)
 
 doc: $(OPENSSL)
-	rustdoc $(OPENSSL_LIB)
+	rustdoc $(RUSTCFGS) $(OPENSSL_LIB)
 
 install: $(OPENSSL)
 	install $(OPENSSL) $(INSTALL_DIR)
diff --git a/configure b/configure
index 7fe7f2bb..92ee62d1 100755
--- a/configure
+++ b/configure
@@ -2,19 +2,27 @@
 
 cd $(dirname $0)
 
-TEMP=`getopt -o "" --long prefix: -n "$0" -- "$@"`
+TEMP=`getopt -o "" --long prefix:,enable-sslv2 -n "$0" -- "$@"`
 
 if [ $? != 0 ]; then exit 1; fi
 
 eval set -- "$TEMP"
 
 PREFIX=/usr/lib
+RUSTCFGS=
 
 while true ; do
     case "$1" in
         --prefix) PREFIX=$2; shift 2;;
+        --enable-sslv2)
+            RUSTCFGS="$RUSTCFGS --cfg sslv2"
+            shift
+            break
+            ;;
         --) shift; break;;
     esac
 done
 
-sed -e "s|%PREFIX%|$PREFIX|" < Makefile.in > Makefile
+sed -e "s|%PREFIX%|$PREFIX|" \
+    -e "s|%RUSTCFGS%|$RUSTCFGS|" \
+    < Makefile.in > Makefile
diff --git a/ssl/mod.rs b/ssl/mod.rs
index e9b4e78b..b28e072c 100644
--- a/ssl/mod.rs
+++ b/ssl/mod.rs
@@ -13,8 +13,6 @@ mod ffi;
 #[cfg(test)]
 mod tests;
 
-static mut INIT: Once = ONCE_INIT;
-
 static mut VERIFY_IDX: c_int = -1;
 static mut MUTEXES: *mut ~[NativeMutex] = 0 as *mut ~[NativeMutex];
 
@@ -28,6 +26,8 @@ macro_rules! try_ssl(
 )
 
 fn init() {
+    static mut INIT: Once = ONCE_INIT;
+
     unsafe {
         INIT.doit(|| {
             ffi::SSL_library_init();