Index: trunk/config.h.in
===================================================================
--- trunk/config.h.in	(revision 3338)
+++ trunk/config.h.in	(revision 3339)
@@ -73,6 +73,9 @@
 print {\n\n/* Define to 1 if you have the `rint' function. */\n}
 print_ternary libs/math/rint/presents {#define HAVE_RINT 1} {/* #undef HAVE_RINT */}
 
+print {\n\n/* Define to 1 if you have the `round' function. */\n}
+print_ternary libs/math/round/presents {#define HAVE_ROUND 1} {/* #undef HAVE_ROUND */}
+
 print {\n\n/* Wrapper for S_ISLNK(x); always return 0 if S_ISLNK doesn't exist */\n}
 switch ?/target/libs/fs/stat/macros/S_ISLNK
 	case {^$} print {#define WRAP_S_ISLNK(x) 0}; end;
Index: trunk/scconfig/Rev.h
===================================================================
--- trunk/scconfig/Rev.h	(revision 3338)
+++ trunk/scconfig/Rev.h	(revision 3339)
@@ -1 +1 @@
-static const int myrev = 3183;
+static const int myrev = 3339;
Index: trunk/scconfig/Rev.tab
===================================================================
--- trunk/scconfig/Rev.tab	(revision 3338)
+++ trunk/scconfig/Rev.tab	(revision 3339)
@@ -1,3 +1,4 @@
+3339	configure	C89: round() is detected by scconfig
 3183	distclean,configure	C89 switchover
 3179	configure	C89 correctness: do not depend on hardwired long long, detect it
 2985	configure	Revcheck installed in Makefiles.
Index: trunk/scconfig/hooks.c
===================================================================
--- trunk/scconfig/hooks.c	(revision 3338)
+++ trunk/scconfig/hooks.c	(revision 3339)
@@ -231,6 +231,7 @@
 	require("libs/fs/realpath/*",  0, 0);
 	require("libs/fs/readdir/*",  0, 1);
 	require("libs/math/rint/*",  0, 0);
+	require("libs/math/round/*",  0, 0);
 	require("libs/userpass/getpwuid/*",  0, 0);
 
 	if (require("libs/ldl",  0, 0) != 0) {
Index: trunk/src/compat_inc.h.in
===================================================================
--- trunk/src/compat_inc.h.in	(revision 3338)
+++ trunk/src/compat_inc.h.in	(revision 3339)
@@ -13,6 +13,7 @@
 @?/target/libs/fs/mkdtemp/includes@
 @?/target/libs/fs/readdir/includes@
 @?/target/libs/userpass/getpwuid/includes@
+@?/target/libs/math/round/includes@
 @]
 
 put /tmpasm/IFS {\n}
Index: trunk/src/compat_misc.c
===================================================================
--- trunk/src/compat_misc.c	(revision 3338)
+++ trunk/src/compat_misc.c	(revision 3339)
@@ -101,3 +101,16 @@
 	memcpy(o, s, l+1);
 	return o;
 }
+
+#ifdef HAVE_ROUND
+#undef round
+double pcb_round(double x)
+{
+	return round(x);
+}
+#else
+double pcb_round(double x)
+{
+#error need to implement round()
+}
+#endif
Index: trunk/src/compat_misc.h
===================================================================
--- trunk/src/compat_misc.h	(revision 3338)
+++ trunk/src/compat_misc.h	(revision 3339)
@@ -37,10 +37,6 @@
 
 #define pcb_strdup_null(x) (((x) != NULL) ? pcb_strdup (x) : NULL)
 
+double pcb_round(double x);
 
-#warning TODO: detect this from scconfig
-#undef round
-extern double round(double x);
-#define pcb_round round
-
 #endif /* PCB_COMPAT_MISC_H */