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-rw-r--r--configure.ac4
1 files changed, 4 insertions, 0 deletions
diff --git a/configure.ac b/configure.ac
index 24a844f1..d1b07f04 100644
--- a/configure.ac
+++ b/configure.ac
@@ -143,6 +143,10 @@ AS_PATH_PYTHON([2.1])
dnl *** checks for libraries ***
+dnl check for libm, for sin() etc.
+AC_CHECK_LIBM
+AC_SUBST(LIBM)
+
dnl *** checks for header files ***
dnl used by ext/dts