diff --git a/Makefile b/Makefile
index bb1d816..59fada9 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 PREFIX=
 CC=cc
-CFLAGS=-O3
-LIBS=-lncurses
+CFLAGS=-O3 -std=gnu99
+LIBS=-lncurses -lm
 
 all: nuke
 
diff --git a/globe.h b/globe.h
index 7d3d7fc..83749b6 100644
--- a/globe.h
+++ b/globe.h
@@ -13,7 +13,8 @@
 
 static const double GOLDEN_RATIO = 1.6180339887498948482045868343656381;
 
-static const int NUM_WAVES = 7;
+#define NUM_WAVES 7
+
 // Randomly generated x/y offsets:
 static const double OFFSETS[2*NUM_WAVES] = {
     0.5459919526, 0.6072439135, 0.6217563193, 0.5444045324, 0.8923452588,
diff --git a/nuke.c b/nuke.c
index f41a350..a157100 100644
--- a/nuke.c
+++ b/nuke.c
@@ -7,6 +7,7 @@
 #include "list.h"
 #include <curses.h>
 #include <errno.h>
+#define __USE_XOPEN_EXTENDED
 #include <ftw.h>
 #include <math.h>
 #include <poll.h>