diff --git a/Makefile.am b/Makefile.am
index 0134d2d..a0dbee1 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -15,7 +15,7 @@ AM_CPPFLAGSINVALID = -DPC_REMOVE_INVALID
 endif
 
 if BUILD_WITH_BTREE
-AM_CPPFLAGSBTREE = -DBUILD_WITH_BTREE
+AM_CPPFLAGSBTREE = -DBUILD_WITH_BTREE -std=c++11
 endif
 
 AM_CPPFLAGS = $(AM_CPPFLAGSBTREE) $(AM_CPPFLAGSINVALID)
diff --git a/configure.ac b/configure.ac
index 715cebf..07474a1 100644
--- a/configure.ac
+++ b/configure.ac
@@ -91,26 +91,33 @@ if test "x$enable_btree" == "xyes"; then
 
   AC_CHECK_TOOL([MERCURIAL], [hg], [no])
 
-  AM_CONDITIONAL([HAVE_HG_BIN], [test "x${MERCURIAL}" = "xhg"])
+  
+  if test "x${MERCURIAL}" = "xhg"; then
+    have_hg_bin=1
+  fi
+  
+  AC_MSG_CHECKING([for ${srcdir}/cpp-btree/btree_map.h])
 
-  AC_MSG_CHECKING([for ${srcdir}/cpp-btree/btree.h])
+  if test -f ${srcdir}/cpp-btree/btree_map.h; then
+    have_btree_h=1
+    AC_MSG_RESULT([found.])
+  else
+    AC_MSG_RESULT([no])
+  fi
 
-  AM_CONDITIONAL([HAVE_BTREE_H], [test -f ${srcdir}/cpp-btree/btree.h])
-
-  AM_COND_IF([HAVE_BTREE_H],
-  [AC_MSG_RESULT([found])
-  have_btree_h=1],
-   [AC_MSG_RESULT([no])])
-
-  if test x$have_btree_h = x1 && ! test ${HAVE_HG_BIN}; then
+  if test "x$have_btree_h" = "x1"; then
     AC_VERBOSE([Using already existing btree.])
     AM_CONDITIONAL([BUILD_WITH_BTREE], [true])
-  elif ${HAVE_HG_BIN} && test x$have_btree_h != x1; then
-    AC_VERBOSE([Downloading btree headers with mercurial])
+  elif test "x$have_hg_bin" = "x1"; then
+    AC_VERBOSE([
+    * Downloading btree headers with mercurial
+    ])
+    
     $(which hg) clone https://code.google.com/p/cpp-btree/
+    AM_CONDITIONAL([BUILD_WITH_BTREE], [true])
   else
     AC_VERBOSE([
-    * Could not find hg in $PATH
+    * Could not find hg in your PATH
     * Building with STL maps instead of Google Btree
     ])
     AM_CONDITIONAL([BUILD_WITH_BTREE], [false])
diff --git a/examples/example2.cpp b/examples/example2.cpp
index 654d0c5..13f095a 100644
--- a/examples/example2.cpp
+++ b/examples/example2.cpp
@@ -6,16 +6,13 @@ using namespace pipecolors;
 
 int main(void) {
    
-   char buffer[128];
-   char * buf;
+   char buffer[256];
    int num = 5;
    const char* str = "My number is";
    const char* str2 = "|10My number is|07";
-   int len = pcprintf("|01%s |41|09%d|39\n", str, num);
+   int len = pcprintf("|01%s |09%d|39\n", str, num);
    pcprintf("|10Length of Len is : |15|30%d\n|07", len);
    int len2 = pcsprintf(buffer, "%s %d\n", str2, num);
    printf("\n%s %d\n", buffer, len2);
-   int len3 = asprintf(&buf, "%s %d\n", str2, num);
-   printf("\n%s %d\n", buf, len3);
    return 0;                  
 }
\ No newline at end of file
diff --git a/libpipecolors.cpp b/libpipecolors.cpp
index 6134160..9594af3 100644
--- a/libpipecolors.cpp
+++ b/libpipecolors.cpp
@@ -27,14 +27,18 @@
 #include <iostream>
 #include <cstring>
 #include <cstdarg>
-#include <map>
 #include <boost/regex.hpp>
 #include "pipecolors.h"
 
 namespace pipecolors {
 
-  //typedef btree::btree_map<std::string, std::string> colors;
+#ifndef BUILD_WITH_BTREE
+#include <map>
   typedef std::map<std::string, std::string> colorMap;
+#else
+#include "cpp-btree/btree_map.h"
+    typedef btree::btree_map<std::string, std::string> colorMap;
+#endif
 
    colorMap getColors() {
     colorMap colors;