math: Ensure declarations of math functions.

[gnulib.git] / modules / logb

diff --git a/modules/logb b/modules/logb
index 7c93afb..9747473 100644 (file)
--- a/modules/logb
+++ b/modules/logb
@@ -7,6 +7,7 @@ m4/mathfunc.m4
 
 Depends-on:
 math
+extensions
 
 configure.ac:
 gl_FUNC_LOGB