Portability fixes.

[userv.git] / INSTALL

diff --git a/INSTALL b/INSTALL
index baf762f9d8e797449bde81be112f698a83bbbd43..dee95972656f39753b378d1ff4d835b5f49fa981 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -84,3 +84,20 @@ malloc, unless stdio makes gratuitous mallocs).  openlog will already
 have been called (but syslog will not necessarily have been called).
 
 We assume that strerror is completely reentrant.
+
+PROBLEMS
+
+* `function declaration isn't a prototype'
+
+  One some systems (at least some versions of NetBSD, for example),
+  the SIG_IGN and SIG_DFL macros contain function declarations (as part
+  of a typecast, presumably) which are not prototypes.  The warning
+  options that are used by default if the configure script detects that
+  you're using a good GCC then cause the compilation to fail.  You must
+  use
+    make CFLAGS=-O2
+  instead of just `make', thus suppressing warnings.
+
+  The bug is actually in your system header files, for not specifying
+  the number and types of arguments to signal handler functions when
+  they cast in the SIG_IGN and SIG_DFL macros.