Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -816,11 +816,11 @@
 esac
 
 AC_CHECK_LIB(m, fmod, LIBS="$LIBS -lm")
 AC_CHECK_LIB(complex, creal, TESTS_LIBS="$TESTS_LIBS -lcomplex")
 
-AC_CHECK_FUNCS(strtof)
+AC_CHECK_FUNCS(strtof truncf)
 
 AC_CHECK_FUNC(asprintf, [
 	case "$host" in
 	*-*-mingw*)
 		dnl asprintf from MinGW is broken on older Windows versions

Index: utils/ofhttp/ProgressBar.m
==================================================================
--- utils/ofhttp/ProgressBar.m
+++ utils/ofhttp/ProgressBar.m
@@ -29,10 +29,14 @@
 #define GIBIBYTE (1024 * 1024 * 1024)
 #define MEBIBYTE (1024 * 1024)
 #define KIBIBYTE (1024)
 
 #define UPDATE_INTERVAL 0.1
+
+#ifndef HAVE_TRUNCF
+# define truncf(x) trunc(x)
+#endif
 
 @implementation ProgressBar
 - (instancetype)initWithLength: (unsigned long long)length
 		   resumedFrom: (unsigned long long)resumedFrom
 		    useUnicode: (bool)useUnicode