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-rw-r--r--digital/io/src/Makefile1
1 files changed, 1 insertions, 0 deletions
diff --git a/digital/io/src/Makefile b/digital/io/src/Makefile
index 0f4a18ef..882856ce 100644
--- a/digital/io/src/Makefile
+++ b/digital/io/src/Makefile
@@ -14,6 +14,7 @@ CONFIGFILE = avrconfig.h
AVR_MCU = atmega128
# Optimize for speed.
OPTIMIZE = -O2
+HOST_LIBS = -lm
# FSMs.
FSM_SOURCES := top move filterbridge elevator cylinder init