diff options
| -rw-r--r-- | gnuradio-core/src/lib/viterbi/metrics.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/gnuradio-core/src/lib/viterbi/metrics.c b/gnuradio-core/src/lib/viterbi/metrics.c index 9f958cab76..77c6a63c86 100644 --- a/gnuradio-core/src/lib/viterbi/metrics.c +++ b/gnuradio-core/src/lib/viterbi/metrics.c @@ -42,6 +42,9 @@ #include <stdlib.h> #include <math.h> +//declare erf in case it was missing in math.h and provided for by the build system +extern double erf(double x); + /* Normal function integrated from -Inf to x. Range: 0-1 */ #define normal(x) (0.5 + 0.5*erf((x)/M_SQRT2)) |