diff --git a/sw/math/.gitignore b/sw/math/.gitignore
new file mode 100644
index 0000000000..b8fcd70872
--- /dev/null
+++ b/sw/math/.gitignore
@@ -0,0 +1 @@
+include/bits/
\ No newline at end of file
diff --git a/sw/math/Makefile b/sw/math/Makefile
new file mode 100644
index 0000000000..8358ab76b5
--- /dev/null
+++ b/sw/math/Makefile
@@ -0,0 +1,17 @@
+BITS_DIR = include/bits
+ALLTYPES_H = $(BITS_DIR)/alltypes.h
+
+
+.PHONY: all clean
+
+all: $(ALLTYPES_H)
+
+clean:
+	rm -rf $(BITS_DIR)
+	rm -f $(ALLTYPES_H)
+
+$(BITS_DIR):
+	mkdir -p $@
+
+$(ALLTYPES_H): | $(BITS_DIR)
+	sed -f tools/mkalltypes.sed arch/riscv64/bits/alltypes.h.in > $@
\ No newline at end of file
diff --git a/sw/math/include/math.h b/sw/math/include/math.h
index 14f28ec8c6..79ef21c185 100644
--- a/sw/math/include/math.h
+++ b/sw/math/include/math.h
@@ -435,6 +435,8 @@ float       pow10f(float);
 long double pow10l(long double);
 #endif
 
+#include "../src/math/tanh.c"
+
 #ifdef __cplusplus
 }
 #endif