diff --git a/INSTALL.txt b/INSTALL.txt
index 8007644..0c2b15e 100644
--- a/INSTALL.txt
+++ b/INSTALL.txt
@@ -9,7 +9,7 @@ Dependencies:
      or..
        Boost Library ( http://www.boost.org ) (see "-with-boost" below)
    - Zlib ( included with OS X and most Linuxes, http://www.zlib.net ) *
-   - C++ compiler with C++11 support
+   - C++ compiler with C++11 and openmp support
 
 
 Steps:
diff --git a/Makefile.in b/Makefile.in
index 6be7ee9..02feaee 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1,4 +1,4 @@
-CXXFLAGS += -O3 -DNDEBUG -std=c++11 -fopenmp -Isrc -I @mathinc@
+CXXFLAGS += -O3 -DNDEBUG -std=c++11 -Isrc -I @mathinc@ @OPENMP_CXXFLAGS@
 CPPFLAGS += @amcppflags@
 
 UNAME_S=$(shell uname -s)
diff --git a/configure.ac b/configure.ac
index 528d665..4f48986 100644
--- a/configure.ac
+++ b/configure.ac
@@ -12,6 +12,8 @@ AC_ARG_WITH(boost, [  --with-boost=<path/to/boost>     Boost Library install dir
 
 AC_LANG(C++)
 
+AC_OPENMP
+
 AC_CHECK_HEADER(zlib.h, [result=1], [result=0])
 
 if test $result == 0
diff --git a/src/common/README.md b/src/common/README.md
new file mode 100644
index 0000000..0cdc6c8
--- /dev/null
+++ b/src/common/README.md
@@ -0,0 +1,5 @@
+Third-party libraries
+=====================
+
+This folder is excluded from the licensing of the rest of the code. The
+corresponding licenses of the third-party libraries applies.