diff --git a/libs/spandsp/configure.ac b/libs/spandsp/configure.ac
index 2f6ac49768..f01a56ef49 100644
--- a/libs/spandsp/configure.ac
+++ b/libs/spandsp/configure.ac
@@ -202,6 +202,8 @@ AC_CHECK_HEADERS([malloc.h])
 case "$host" in
     *freebsd*)
     ;;
+    *dragonfly*)
+    ;;
     *)
     AC_CHECK_HEADERS([tgmath.h], [INSERT_TGMATH_HEADER="#include <tgmath.h>"])
     ;;