diff --git a/libvisual-plugins/configure.ac b/libvisual-plugins/configure.ac
index e2af05843..9bc0e5306 100644
--- a/libvisual-plugins/configure.ac
+++ b/libvisual-plugins/configure.ac
@@ -51,8 +51,7 @@ dnl 'Standard' header files.
 AC_CHECK_HEADERS([fcntl.h unistd.h stdlib.h string.h sys/time.h])
 
 dnl Library functions.
-AC_FUNC_MALLOC
-AC_CHECK_FUNCS([floor gettimeofday memmove memset pow sqrt])
+AC_CHECK_FUNCS([gettimeofday])
 AC_CHECK_FUNC([munmap], lv_have_munmap=yes, lv_have_munmap=no)
 AC_FUNC_MMAP
 
diff --git a/libvisual/configure.ac b/libvisual/configure.ac
index 34406ae8f..4c7382e32 100644
--- a/libvisual/configure.ac
+++ b/libvisual/configure.ac
@@ -135,10 +135,8 @@ AC_MSG_RESULT($lv_have_gnuc_varargs)
 AC_C_BIGENDIAN(bigendian=yes, bigendian=no, )
 
 # Checks for library functions.
-AC_FUNC_MALLOC
-AC_FUNC_REALLOC
 AC_FUNC_SELECT_ARGTYPES
-AC_CHECK_FUNCS([gettimeofday usleep nanosleep select memset sqrt strdup strndup sysconf])
+AC_CHECK_FUNCS([gettimeofday usleep nanosleep select strdup strndup sysconf])
 
 AC_CHECK_LIB([dl], [dlsym], [LIBS="-ldl $LIBS"],
 	     AC_MSG_WARN([*** You need dlsym() to make use of Libvisual.]))