1 files changed, 6 insertions, 1 deletions

diff --git a/configure.in b/configure.in
index df516c54..b209d19a 100644
--- a/configure.in
+++ b/configure.in
@@ -137,6 +137,11 @@ AC_CHECK_LIB(socket,socket,SOCKETLIBS="$SOCKETLIBS -lsocket")
 AC_CHECK_LIB(resolv,main,SOCKETLIBS="$SOCKETLIBS -lresolv")
 AC_SUBST(SOCKETLIBS)
 
+dnl
+dnl check for math-related functions needing -lm
+AC_CHECK_LIB(m,floor,MATHLIBS="-lm")
+AC_SUBST(MATHLIBS)
+
 dnl Check for PostgreSQL libraries
 _SAVEDLIBS="$LIBS"
 _SAVEDCPPFLAGS="$CPPFLAGS"
@@ -567,7 +572,7 @@ AC_TRY_COMPILE([#include <sys/time.h>],
                               AC_DEFINE(NEED_GETTIMEOFDAY,1,[Define if gettimeofday is needed])))
 
 dnl Checks for library functions.
-AC_CHECK_FUNCS(memmove select socket strdup strstr strtod strtol strtoul)
+AC_CHECK_FUNCS(memmove select socket strdup strstr strtod strtol strtoul, floor)
 
 AC_MSG_CHECKING(return type of socket size)
 AC_TRY_COMPILE([#include <stdlib.h>