They don't seem to have been generated right:
.TH "interrupt.h" 3 "15 May 2007" "Version 1.4.6" "avr-libc" \" -*- nroff -*-
.ad l
.nh
.SH NAME
interrupt.h \-
.SH "Detailed Description"
.PP
@{
.SH SYNOPSIS
.br
.PP
.SS "Global manipulation of the interrupt flag"
The global interrupt flag is maintained in the I bit of the status register (SREG).
.in +1c
.ti -1c
.RI "#define \fBsei\fP()"
.br
.ti -1c
.RI "#define \fBcli\fP()"
.br
.in -1c
.SS "Macros for writing interrupt handler functions"
.in +1c
.ti -1c
.RI "#define \fBISR\fP(vector)"
.br
.ti -1c
.RI "#define \fBSIGNAL\fP(vector)"
.br
.ti -1c
.RI "#define \fBEMPTY_INTERRUPT\fP(vector)"
.br
.ti -1c
.RI "#define \fBISR_ALIAS\fP(vector, target_vector)"
.br
.in -1c
.SH "Author"
.PP
Generated automatically by Doxygen for avr-libc from the source code.
:( Is this an avr-libc problem, or winavr compilation problem?
