diff --git a/INSTALL b/INSTALL
index 3b85d3b..06256be 100644
--- a/INSTALL
+++ b/INSTALL
@@ -27,6 +27,11 @@ By default, Pysearpc are compiled. If you'd like to not compile pysearpc, use th
 
 In this way, Pysearpc would not be compiled or installed.
  
+In MacOs, if you want to use py2app, you would better run the following commnads:
+   ./configure LDFLAGS="-Xlinker -headerpad_max_install_names"
+In this way, the following error will be avoided:
+   raise ValueError("New Mach-O header is too large to relocate")
+
 
 Optionally compile demos
 ========================
diff --git a/autogen.sh b/autogen.sh
index c74acc1..44c7348 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -55,7 +55,7 @@ fi
 if test x"$MSYSTEM" = x"MINGW32"; then
     autoreconf --install -I/local/share/aclocal
 elif test "${TERM_PROGRAM}" = "Apple_Terminal" ; then
-    autoreconf --install -I/usr/local/share/aclocal
+    autoreconf --install -I/opt/local/share/aclocal
 else
     autoreconf --install
 fi