The Operating Systems and the version of gcc used to compile the binaries are 
listed below. Also listed is the exact command used to compile the binary.

All binaries are compiled natively on their respective platforms, except for
qd.exe and qdiprint.exe which are cross-compiled on Linux. A native version for
Windows is also available as qd-native.exe

It is possible that one or more of the binaries are out of date with qd.c. To 
compile qd yourself, simply use the gcc command for your Operating System 
listed below. 

A note in respect to compiling on Mac OS X:
 Optimize for size is the standard, recommended option on PPC.
 If using OSX 10.4, be sure to use gcc-3.3, or your binary won't run pre 10.3.9.

Linux/x86
---------
qd
 Compiled on   : Debian GNU/Linux 6.0 "Squeeze", with gcc 4.4.5 (Debian 4.4.5-8)
 Compiled with : gcc -Wall -m32 -D_GNU_SOURCE -DSYSTYPE=0 -s -O2 -o qd qd.c

qdiprint
 Compiled on   : Debian GNU/Linux 5.0 "Lenny", with gcc 4.3.2 (Debian 4.3.2-1.1)
 Compiled with : gcc -Wall -m32 -s -O2 -o qdiprint qdiprint.c

qfix
 Compiled on   : Debian GNU/Linux 6.0 "Squeeze", with gcc 4.4.5 (Debian 4.4.5-8)
 Compiled with : gcc -Wall -DSYSTYPE=0 -s -O2 -o qfix qfix.c

wuinfo
 Compiled on   : Debian GNU/Linux 4.0 "Etch" with gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
 Compiled with : gcc -Wall -DSYSTYPE=0 -s -O2 -o wuinfo wuinfo.c

xyz2pdb
 Compiled on   : Debian GNU/Linux 4.0 "Etch" with gcc version 4.1.2 20061115 (prerelease) (Debian 4.1.1-21)
 Compiled with : gcc -Wall -DSYSTYPE=0 -s -O2 -lm -o xyz2pdb wuinfo.c

Windows/x86
-----------
qd.exe
 Compiled on   : Debian GNU/Linux 6.0 "Squeeze", with gcc version 4.2.1-sjlj (mingw32-2)
 Compiled with : i586-mingw32msvc-gcc -Wall -m32 -D_GNU_SOURCE -DSYSTYPE=1 -s -O2 -o qd.exe qd.c

qd-native.exe
 Compiled on   : Windows XP Professional SP3, with gcc version 3.4.4 (cygwin special) (qdc 0.12, using dmd 0.125)
 Compiled with : gcc -Wall -D_GNU_SOURCE -DSYSTYPE=1 -s -O2 -mno-cygwin -o qd-native.exe qd.c

qdiprint.exe
 Compiled on   : Debian GNU/Linux 5.0 "Lenny", with gcc version 4.2.1-sjlj (mingw32-2)
 Compiled with : i586-mingw32msvc-gcc -Wall -m32 -s -O2 -o qdiprint.exe qdiprint.c

qdiprint-native.exe
 Compiled on   : Windows XP Professional SP3, with gcc version 3.4.4 (cygwin special) (qdc 0.12, using dmd 0.125)
 Compiled with : gcc -Wall -s -O2 -mno-cygwin -o qdiprint-native.exe qdiprint.c

qfix.exe
 Compiled on   : Debian GNU/Linux 6.0 "Squeeze", with gcc 4.4.5 (Debian 4.4.5-8)
 Compiled with : i586-mingw32msvc-gcc -Wall -DSYSTYPE=1 -s -O2 -o qfix.exe qfix.c

qfix-native.exe
 Compiled on   : Windows XP Professional SP2, with gcc version 3.4.4 (cygwin special) (qdc 0.12, using dmd 0.125)
 Compiled with : gcc -Wall -s -O2 -mno-cygwin -o qfix-native.exe qfix.c

wuinfo.exe
 Compiled on   : Debian GNU/Linux 4.0 "Etch", with gcc version 3.4.5 (mingw special)
 Compiled with : i586-mingw32msvc-gcc -Wall -DSYSTYPE=1 -s -O2 -o wuinfo.exe wuinfo.c

wuinfo-native.exe
 Compiled on   : Windows XP Professional SP2, with gcc version 3.4.4 (cygwin special) (qdc 0.12, using dmd 0.125)
 Compiled with : gcc -Wall -s -O2 -mno-cygwin -o wuinfo-native.exe wuinfo.c

xyz2pdb.exe
 Compiled on   : Debian GNU/Linux 4.0 "Etch", with gcc version 3.4.5 (mingw special)
 Compiled with : i586-mingw32msvc-gcc -Wall -DSYSTYPE=1 -s -O2 -lm -o xyz2pdb.exe xyz2pdb.c

xyz2pdb-native.exe
 Compiled on   : Windows XP Professional SP3, with gcc version 3.4.4 (cygwin special) (qdc 0.12, using dmd 0.125)
 Compiled with : gcc -Wall -s -O2 -lm -mno-cygwin -o xyz2pdb-native.exe xyz2pdb.c

OpenBSD/x86
-----------
qd
 Compiled on   : OpenBSD 5.0, with gcc 4.2.1 20070719
 Compiled with : gcc -Wall -D_GNU_SOURCE -DSYSTYPE=0 -s -O2 -o qd qd.c

qdiprint
 Compiled on   : OpenBSD 4.6, with gcc version 3.3.5 (propolice)
 Compiled with : gcc -Wall -s -O2 -o qdiprint qdiprint.c

qfix
 Compiled on   : OpenBSD 5.0, with gcc 4.2.1 20070719
 Compiled with : gcc -Wall -s -O2 -o qfix qfix.c

wuinfo
 Compiled on   : OpenBSD 4.4, with gcc version 3.3.5 (propolice)
 Compiled with : gcc -Wall -s -O2 -o wuinfo wuinfo.c

xyz2pdb
 Compiled on   : OpenBSD 4.4, with gcc version 3.3.5 (propolice)
 Compiled with : gcc -Wall -s -O2 -lm -o xyz2pdb xyz2pdb.c

FreeBSD/x86
-----------
qd
 Compiled on   : FreeBSD 8.1, with gcc version 4.2.1 20070719  [FreeBSD]
 Compiled with : gcc -Wall -D_GNU_SOURCE -DSYSTYPE=0 -s -O2 -o qd qd.c

qdiprint
 Compiled on   : FreeBSD 8.0, with gcc version 4.2.1 20070719  [FreeBSD]
 Compiled with : gcc -Wall -s -O2 -o qdiprint qdiprint.c

qfix
 Compiled on   : FreeBSD 8.1, with gcc version 4.2.1 20070719  [FreeBSD]
 Compiled with : gcc -Wall -s -O2 -o qfix qfix.c

wuinfo
 Compiled on   : FreeBSD 7.0, with gcc version 4.2.1 20070719  [FreeBSD]
 Compiled with : gcc -Wall -s -O2 -o wuinfo wuinfo.c

xyz2pdb
 Compiled on   : FreeBSD 7.1, with gcc version 4.2.1 20070719  [FreeBSD]
 Compiled with : gcc -Wall -s -O2 -lm -o xyz2pdb xyz2pdb.c

Mac OS X/PPC
------------
qd
 Compiled on   : Mac OS X 10.4, with gcc version 3.3 20030304 (Apple Computer, Inc. build 1666)
 Compiled with : gcc-3.3 -Wall -DSYSTYPE=2 -s -Os -o qd qd.c

qdiprint
 Compiled on   : Mac OS X 10.4, with gcc version 3.3 20030304 (Apple Computer, Inc. build 1666)
 Compiled with : gcc-3.3 -Wall -s -Os -o qdiprint qdiprint.c

qfix
 Compiled on   : Mac OS X 10.4, with gcc version 3.3 20030304 (Apple Computer, Inc. build 1666)
 Compiled with : gcc-3.3 -Wall -DSYSTYPE=2 -s -Os -o qfix qfix.c

wuinfo
 Compiled on   : Mac OS X 10.4, with gcc version 3.3 20030304 (Apple Computer, Inc. build 1666)
 Compiled with : gcc-3.3 -Wall -DSYSTYPE=2 -s -Os -o wuinfo wuinfo.c

xyz2pdb
 Compiled on   : Mac OS X 10.4, with gcc version 3.3 20030304 (Apple Computer, Inc. build 1666)
 Compiled with : gcc-3.3 -Wall -DSYSTYPE=2 -s -Os -lm -o xyz2pdb xyz2pdb.c

Mac OS X/x86
------------
qd
 Compiled on   : Mac OS X 10.6, with gcc version 4.0.1 (Apple Inc. build 5493)
 Compiled with : gcc -Wall -DSYSTYPE=3 -s -Os -o qd qd.c

qdiprint
 Compiled on   : Mac OS X 10.6, with gcc version 4.0.1 (Apple Inc. build 5493)
 Compiled with : gcc -Wall -s -Os -o qdiprint qdiprint.c

qfix
 Compiled on   : Mac OS X 10.6, with gcc version 4.0.1 (Apple Inc. build 5493)
 Compiled with : gcc -Wall -DSYSTYPE=3 -s -Os -o qfix qfix.c

wuinfo
 Compiled on   : Mac OS X 10.4, with gcc version 4.0.1 (Apple Computer, Inc. build 5367)
 Compiled with : gcc -Wall -DSYSTYPE=3 -s -Os -o wuinfo wuinfo.c

xyz2pdb
 Compiled on   : Mac OS X 10.4, with gcc version 4.0.1 (Apple Computer, Inc. build 5367)
 Compiled with : gcc -Wall -DSYSTYPE=3 -s -Os -lm -o xyz2pdb xyz2pdb.c