patch 7.4.1144
Problem:    Can't build on several systems.
Solution:   Include float.h. (Christian Robinson, closes #570 #571)
diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index 11c3cf4..6bd7afc 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -14,6 +14,10 @@
 #include "vim.h"
 #include "version.h"
 
+#ifdef FEAT_FLOAT
+# include <float.h>
+#endif
+
 #ifdef FEAT_EX_EXTRA
 static int linelen __ARGS((int *has_tab));
 #endif