1 files changed, 85 insertions, 0 deletions
diff --git a/m4/libpq.m4 b/m4/libpq.m4
new file mode 100644
index 0000000..86fd38a
--- /dev/null
+++ b/m4/libpq.m4
@@ -0,0 +1,85 @@
+dnl file      : m4/libpq.m4
+dnl author    : Constantin Michael <constantin@codesynthesis.com>
+dnl copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+dnl license   : GNU GPL v2; see accompanying LICENSE file
+dnl
+dnl LIBPQ([ACTION-IF-FOUND[,
+dnl       ACTION-IF-NOT-FOUND]])
+dnl
+dnl
+AC_DEFUN([LIBPQ], [
+libpq_found=no
+
+AC_PATH_PROG([pg_config],[pg_config])
+
+AC_MSG_CHECKING([for libpq])
+
+# Check for libpq using default CPPFLAGS/LDFLAGS.
+#
+save_LIBS="$LIBS"
+LIBS="-lpq $LIBS"
+
+CXX_LIBTOOL_LINK_IFELSE(
+AC_LANG_SOURCE([[
+#include <libpq-fe.h>
+
+int
+main ()
+{
+  PGconn* conn = PQconnectdb ("");
+  char* dbname =  PQdb (conn);
+  PQfinish (conn);
+  return 0;
+}
+]]),
+[
+libpq_found=yes
+])
+
+if test x"$libpq_found" = xno; then
+
+  # If default CPPFLAGS/LDFLAGS didn't work, try to discover
+  # them using pg_config.
+  #
+  if test x"$libpq_found" = xno; then
+
+    if test x"$pg_config" != x; then
+      save_CPPFLAGS="$CPPFLAGS"
+
+      CPPFLAGS=-I`$pg_config --includedir`
+      CPPFLAGS="$CPPFLAGS $save_CPPFLAGS"
+
+      CXX_LIBTOOL_LINK_IFELSE(
+AC_LANG_SOURCE([[
+#include <libpq-fe.h>
+
+int
+main ()
+{
+  PGconn* conn = PQconnectdb ("");
+  char* dbname =  PQdb (conn);
+  PQfinish (conn);
+  return 0;
+}
+]]),
+[
+libpq_found=yes
+])
+
+     if test x"$libpq_found" = xno; then
+       CPPFLAGS="$save_CPPFLAGS"
+     fi
+
+    fi
+  fi
+fi
+
+if test x"$libpq_found" = xyes; then
+  AC_MSG_RESULT([yes])
+  $1
+else
+  LIBS="$save_LIBS"
+  AC_MSG_RESULT([no])
+  $2
+fi
+])dnl