compiliation problem with libbalsa from v0.4.6.2

[Rehan Khwaja <rkhwaja usa net>]

I have a Red Hat 5.2 system with the (pretty much) the latest gnome and
gtk.

I get the following errors when compiling the balsa 0.4.6.2

gcc -DHAVE_CONFIG_H -I. -I. -I.. -I. -I../src -I.. -I/usr/include
-DNEED_GNOMESUPPORT_H -I/usr/lib/gnome-libs/include -I/usr/X11R6/include
-I/usr/lib/glib/include -I/usr/X11R6/include -I/usr/lib/glib/include -g
-O2 -Wall -Wmissing-prototypes -Wpointer-arith -c misc.c
misc.c: In function `readfile':
misc.c:171: `errno' undeclared (first use this function)
misc.c:171: (Each undeclared identifier is reported only once
misc.c:171: for each function it appears in.)
misc.c:171: `EAGAIN' undeclared (first use this function)
misc.c:171: `EINTR' undeclared (first use this function)
make: *** [misc.o] Error 1

the same thing (errno) is in mime.c

thanks for any help