bugfix: for statically linked luajit, we need to pass -ldl to the lin…

…ker. thanks cf2012 for the report in openresty/openresty#40.

config

@@ -18,6 +18,19 @@ if [ -n "$LUAJIT_INC" -o -n "$LUAJIT_LIB" ]; then
 
     . auto/feature
 
+    if [ $ngx_found = no ]; then
+        # retry with -ldl, static linking on Linux requires it.
+        ngx_feature="LuaJIT library in $LUAJIT_LIB and $LUAJIT_INC (specified by the LUAJIT_LIB and LUAJIT_INC env, with -ldl)"
+        ngx_feature_path="$LUAJIT_INC"
+        if [ $NGX_RPATH = YES ]; then
+            ngx_feature_libs="-R$LUAJIT_LIB -L$LUAJIT_LIB -lluajit-5.1 -lm -ldl"
+        else
+            ngx_feature_libs="-L$LUAJIT_LIB -lluajit-5.1 -lm -ldl"
+        fi
+
+        . auto/feature
+    fi
+
     if [ $ngx_found = no ]; then
         cat << END
         $0: error: ngx_http_lua_module requires the Lua or LuaJIT library and LUAJIT_LIB is defined as $LUAJIT_LIB and LUAJIT_INC (path for lua.h) $LUAJIT_INC, but we cannot find LuaJIT there.
@@ -161,6 +174,18 @@ END
             fi
             . auto/feature
         fi
+
+        if [ $ngx_found = no ]; then
+            # Gentoo with LuaJIT-2.0, retry with -ldl
+            ngx_feature="LuaJIT library in /usr/"
+            ngx_feature_path="/usr/include/luajit-2.0"
+            if [ $NGX_RPATH = YES ]; then
+                ngx_feature_libs="-R/usr/lib -L/usr/lib -lm -lluajit-5.1 -ldl"
+            else
+                ngx_feature_libs="-L/usr/lib -lm -lluajit-5.1 -ldl"
+            fi
+            . auto/feature
+        fi
     fi
 fi