Look for log10f function in libm.
See also: https://bugs.gentoo.org/show_bug.cgi?id=586148

--- a/configure.in
+++ b/configure.in
@@ -1,8 +1,8 @@
 dnl Process this file with autoconf to produce a configure script.
 
-AC_INIT(configure.in)
-AM_INIT_AUTOMAKE(bitmeter, 1.2)
-AM_CONFIG_HEADER(config.h)
+AC_INIT([bitmeter], [1.2])
+AM_INIT_AUTOMAKE
+AC_CONFIG_HEADERS([config.h])
 AM_MAINTAINER_MODE
 
 AC_ISC_POSIX
@@ -10,6 +10,12 @@
 AM_PROG_CC_STDC
 AC_HEADER_STDC
 
+dnl Find log10f
+dnl Gentoo-bug: 586148
+AC_SEARCH_LIBS([log10f], [m], [], [
+	AC_MSG_ERROR([unable to find the log10f() function])
+])
+
 pkg_modules="gtk+-2.0 >= 2.0.0"
 PKG_CHECK_MODULES(PACKAGE, [$pkg_modules])
 AC_SUBST(PACKAGE_CFLAGS)