diff --git a/Makefile b/Makefile
index 7b81d36..3e0f78a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,8 @@
 CC = gcc
-CFLAGS = -Wall -Wpedantic -Wextra -O2 -march=native
+CFLAGS = -Wall -Wpedantic -Wextra -O2 -march=native\
+ -DTHREADS=$(shell grep processor /proc/cpuinfo | wc -l)\
+ -DPOLLING_TIME=$(shell read -p "type seconds between temp checks >" P;\
+  echo $$P)
 SRC = src
 BINDIR = bin
 BIN = homemade_speedstep
diff --git a/src/homemade_speedstep.c b/src/homemade_speedstep.c
index 06c20ef..4bdb366 100644
--- a/src/homemade_speedstep.c
+++ b/src/homemade_speedstep.c
@@ -3,8 +3,6 @@
 #include <unistd.h>
 
 #define VERSION "1.1"
-#define POLLING_TIME 1
-#define THREADS 4 /* TODO: automatically figure out how many threads host system has */
 #define FREQS "/sys/devices/system/cpu/cpufreq/policy0/scaling_available_frequencies"
 #define MAXSPDPREFIX "/sys/devices/system/cpu/cpu"
 #define MAXSPDSUFFIX "/cpufreq/scaling_max_freq"