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diff --git a/src/fc/fslibos.h b/src/fc/fslibos.h
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+/* $Xorg: fslibos.h,v 1.4 2001/02/09 02:04:03 xorgcvs Exp $ */
+/*
+ * Copyright 1990 Network Computing Devices;
+ * Portions Copyright 1987 by Digital Equipment Corporation
+ */
+
+/*
+
+Copyright 1987, 1994, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+*/
+
+/*
+ * FSlib networking & os include file
+ */
+
+#include <X11/Xtrans.h>
+
+#ifndef WIN32
+
+/*
+ * makedepend screws up on #undef OPEN_MAX, so we define a new symbol
+ */
+
+#ifndef FONT_OPEN_MAX
+
+#ifndef X_NOT_POSIX
+#ifdef _POSIX_SOURCE
+#include <limits.h>
+#else
+#define _POSIX_SOURCE
+#include <limits.h>
+#undef _POSIX_SOURCE
+#endif
+#endif
+#ifndef OPEN_MAX
+#ifdef SVR4
+#define OPEN_MAX 256
+#else
+#include <sys/param.h>
+#ifndef OPEN_MAX
+#ifdef __OSF1__
+#define OPEN_MAX 256
+#else
+#ifdef NOFILE
+#define OPEN_MAX NOFILE
+#else
+#define OPEN_MAX NOFILES_MAX
+#endif
+#endif
+#endif
+#endif
+#endif
+
+#if OPEN_MAX > 256
+#define FONT_OPEN_MAX 256
+#else
+#define FONT_OPEN_MAX OPEN_MAX
+#endif
+
+#endif /* FONT_OPEN_MAX */
+
+#ifdef WORD64
+#define NMSKBITS 64
+#else
+#define NMSKBITS 32
+#endif
+
+#define MSKCNT ((FONT_OPEN_MAX + NMSKBITS - 1) / NMSKBITS)
+
+typedef unsigned long FdSet[MSKCNT];
+typedef FdSet FdSetPtr;
+
+#if (MSKCNT==1)
+#define BITMASK(i) (1 << (i))
+#define MASKIDX(i) 0
+#endif
+
+#if (MSKCNT>1)
+#define BITMASK(i) (1 << ((i) & (NMSKBITS - 1)))
+#define MASKIDX(i) ((i) / NMSKBITS)
+#endif
+
+#define MASKWORD(buf, i) buf[MASKIDX(i)]
+#define BITSET(buf, i) MASKWORD(buf, i) |= BITMASK(i)
+#define BITCLEAR(buf, i) MASKWORD(buf, i) &= ~BITMASK(i)
+#define GETBIT(buf, i) (MASKWORD(buf, i) & BITMASK(i))
+
+#if (MSKCNT==1)
+#define COPYBITS(src, dst) dst[0] = src[0]
+#define CLEARBITS(buf) buf[0] = 0
+#define MASKANDSETBITS(dst, b1, b2) dst[0] = (b1[0] & b2[0])
+#define ORBITS(dst, b1, b2) dst[0] = (b1[0] | b2[0])
+#define UNSETBITS(dst, b1) (dst[0] &= ~b1[0])
+#define ANYSET(src) (src[0])
+#endif
+
+#if (MSKCNT==2)
+#define COPYBITS(src, dst) { dst[0] = src[0]; dst[1] = src[1]; }
+#define CLEARBITS(buf) { buf[0] = 0; buf[1] = 0; }
+#define MASKANDSETBITS(dst, b1, b2) {\
+ dst[0] = (b1[0] & b2[0]);\
+ dst[1] = (b1[1] & b2[1]); }
+#define ORBITS(dst, b1, b2) {\
+ dst[0] = (b1[0] | b2[0]);\
+ dst[1] = (b1[1] | b2[1]); }
+#define UNSETBITS(dst, b1) {\
+ dst[0] &= ~b1[0]; \
+ dst[1] &= ~b1[1]; }
+#define ANYSET(src) (src[0] || src[1])
+#endif
+
+#if (MSKCNT==3)
+#define COPYBITS(src, dst) { dst[0] = src[0]; dst[1] = src[1]; \
+ dst[2] = src[2]; }
+#define CLEARBITS(buf) { buf[0] = 0; buf[1] = 0; buf[2] = 0; }
+#define MASKANDSETBITS(dst, b1, b2) {\
+ dst[0] = (b1[0] & b2[0]);\
+ dst[1] = (b1[1] & b2[1]);\
+ dst[2] = (b1[2] & b2[2]); }
+#define ORBITS(dst, b1, b2) {\
+ dst[0] = (b1[0] | b2[0]);\
+ dst[1] = (b1[1] | b2[1]);\
+ dst[2] = (b1[2] | b2[2]); }
+#define UNSETBITS(dst, b1) {\
+ dst[0] &= ~b1[0]; \
+ dst[1] &= ~b1[1]; \
+ dst[2] &= ~b1[2]; }
+#define ANYSET(src) (src[0] || src[1] || src[2])
+#endif
+
+#if (MSKCNT==4)
+#define COPYBITS(src, dst) dst[0] = src[0]; dst[1] = src[1]; \
+ dst[2] = src[2]; dst[3] = src[3]
+#define CLEARBITS(buf) buf[0] = 0; buf[1] = 0; buf[2] = 0; buf[3] = 0
+#define MASKANDSETBITS(dst, b1, b2) \
+ dst[0] = (b1[0] & b2[0]);\
+ dst[1] = (b1[1] & b2[1]);\
+ dst[2] = (b1[2] & b2[2]);\
+ dst[3] = (b1[3] & b2[3])
+#define ORBITS(dst, b1, b2) \
+ dst[0] = (b1[0] | b2[0]);\
+ dst[1] = (b1[1] | b2[1]);\
+ dst[2] = (b1[2] | b2[2]);\
+ dst[3] = (b1[3] | b2[3])
+#define UNSETBITS(dst, b1) \
+ dst[0] &= ~b1[0]; \
+ dst[1] &= ~b1[1]; \
+ dst[2] &= ~b1[2]; \
+ dst[3] &= ~b1[3]
+#define ANYSET(src) (src[0] || src[1] || src[2] || src[3])
+#endif
+
+#if (MSKCNT>4)
+#define COPYBITS(src, dst) memmove((caddr_t) dst, (caddr_t) src,\
+ MSKCNT*sizeof(long))
+#define CLEARBITS(buf) bzero((caddr_t) buf, MSKCNT*sizeof(long))
+#define MASKANDSETBITS(dst, b1, b2) \
+ { int cri; \
+ for (cri=MSKCNT; --cri>=0; ) \
+ dst[cri] = (b1[cri] & b2[cri]); }
+#define ORBITS(dst, b1, b2) \
+ { int cri; \
+ for (cri=MSKCNT; --cri>=0; ) \
+ dst[cri] = (b1[cri] | b2[cri]); }
+#define UNSETBITS(dst, b1) \
+ { int cri; \
+ for (cri=MSKCNT; --cri>=0; ) \
+ dst[cri] &= ~b1[cri]; }
+#if (MSKCNT==8)
+#define ANYSET(src) (src[0] || src[1] || src[2] || src[3] || \
+ src[4] || src[5] || src[6] || src[7])
+#endif
+#endif
+
+#else /* not WIN32 */
+
+#include <X11/Xwinsock.h>
+#include <X11/Xw32defs.h>
+
+typedef fd_set FdSet;
+typedef FdSet *FdSetPtr;
+
+#define CLEARBITS(set) FD_ZERO(&set)
+#define BITSET(set,s) FD_SET(s,&set)
+#define BITCLEAR(set,s) FD_CLR(s,&set)
+#define GETBIT(set,s) FD_ISSET(s,&set)
+#define ANYSET(set) set->fd_count
+
+#endif
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