recommend building in a subdir

diff --git a/README.md b/README.md
index a9dda8261c2857a95ba7668b68e557f59d4c28d5..9bf471f1dda1a356904f5d0e20cba8a19dbe1389 100644 (file)
--- a/README.md
+++ b/README.md
@@ -15,7 +15,9 @@ NLopt is compiled and installed with the [CMake][1] build system
 
     git clone git://github.com/stevengj/nlopt
     cd nlopt
-    cmake .
+    mkdir build
+    cd build
+    cmake ..
     make
     sudo make install