dc: conditionalize parts which require libm
diff --git a/miscutils/Config.in b/miscutils/Config.in
index 0c80ae6..15f677a 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -138,6 +138,14 @@
Dc is a reverse-polish desk calculator which supports unlimited
precision arithmetic.
+config FEATURE_DC_LIBM
+ bool "Enable power and exp functions (requires libm)"
+ default n
+ depends on DC
+ help
+ Enable power and exp functions.
+ NOTE: This will require libm to be present for linking.
+
config DEVFSD
bool "devfsd (obsolete)"
default n