vstinner · Nov 5, 2026 · Sep 22, 2026 · Sep 22, 2026 · Nov 4, 2026 · Nov 5, 2026
diff --git a/Lib/test/test_fcntl.py b/Lib/test/test_fcntl.py
@@ -73,7 +73,7 @@ def get_lockdata():
                                    fcntl.F_WRLCK, 0)
         elif sys.platform.startswith('gnukfreebsd'):
             lockdata = struct.pack('qqihhi', 0, 0, 0, fcntl.F_WRLCK, 0, 0)
-        elif sys.platform in ['hp-uxB', 'unixware7']:
+        elif sys.platform == 'hp-uxB':
             lockdata = struct.pack('hhlllii', fcntl.F_WRLCK, 0, 0, 0, 0, 0, 0)
         else:
             lockdata = struct.pack('hh'+start_len+'hh', fcntl.F_WRLCK, 0, 0, 0, 0, 0)

diff --git a/Misc/NEWS.d/next/Build/2026-09-22-09-13-06.gh-issue-157949.EZ8avp.rst b/Misc/NEWS.d/next/Build/2026-09-22-09-13-06.gh-issue-157949.EZ8avp.rst
@@ -0,0 +1,2 @@
+Remove dead build and preprocessor code for SCO UnixWare, OpenUNIX, SCO
+OpenServer and ReliantUNIX.
diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
@@ -120,7 +120,7 @@ static const char PyCursesVersion[] = "2.2";
 #include <langinfo.h>
 #endif
 
-#if !defined(NCURSES_VERSION) && (defined(__sun) || defined(SCO5))
+#if !defined(NCURSES_VERSION) && defined(__sun)
 #define STRICT_SYSV_CURSES       /* Don't use ncurses extensions */
 typedef chtype attr_t;           /* No attr_t type is available */
 #endif

diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
@@ -14146,11 +14146,6 @@ os_WSTOPSIG_impl(PyObject *module, int status)
 
 
 #if defined(HAVE_FSTATVFS) && defined(HAVE_SYS_STATVFS_H)
-#ifdef _SCO_DS
-/* SCO OpenServer 5.0 and later requires _SVID3 before it reveals the
-   needed definitions in sys/statvfs.h */
-#define _SVID3
-#endif
 #include <sys/statvfs.h>
 
 #ifdef __APPLE__

@@ -506,8 +506,7 @@ Py_NO_ENABLE_SHARED to find out.  Also support MS_NO_COREDLL for b/w compat */
 /* Define if you have the putenv function.  */
 #define HAVE_PUTENV
 
-/* Define if  you can safely include both <sys/select.h> and <sys/time.h>
-   (which you can't on SCO ODT 3.0). */
+/* Define if  you can safely include both <sys/select.h> and <sys/time.h> */
 /* #undef SYS_SELECT_WITH_SYS_TIME */
 
 /* Define if you want build the _decimal module using a coroutine-local rather

diff --git a/Tools/build/check_capi_macros_ignored.txt b/Tools/build/check_capi_macros_ignored.txt
@@ -719,7 +719,6 @@ SSTATE_INTERNED_IMMORTAL_STATIC
 SSTATE_INTERNED_MORTAL
 SSTATE_NOT_INTERNED
 STDC_HEADERS
-STRICT_SYSV_CURSES
 SYS_SELECT_WITH_SYS_TIME
 S_IFLNK
 S_IFMT

@@ -238,11 +238,6 @@ AH_TOP([
 #define Py_PYCONFIG_H
 ])
 AH_BOTTOM([
-/* Define the macros needed if on a UnixWare 7.x system. */
-#if defined(__USLC__) && defined(__SCO_VERSION__)
-#define STRICT_SYSV_CURSES /* Don't use ncurses extensions */
-#endif
-
 #endif /*Py_PYCONFIG_H*/
 ])
 
@@ -377,8 +372,7 @@ then
 	ac_sys_release=
     else
 	ac_sys_system=`uname -s`
-	if test "$ac_sys_system" = "AIX" \
-	-o "$ac_sys_system" = "UnixWare" -o "$ac_sys_system" = "OpenUNIX"; then
+	if test "$ac_sys_system" = "AIX"; then
 		ac_sys_release=`uname -v`
 	else
 		ac_sys_release=`uname -r`
@@ -1019,15 +1013,6 @@ case $ac_sys_system/$ac_sys_release in
   # A lower level is defined below.
   SunOS/*)
     define_xopen_source=no;;
-  # On UnixWare 7, u_long is never defined with _XOPEN_SOURCE,
-  # but used in /usr/include/netinet/tcp.h. Reported by Tim Rice.
-  # Reconfirmed for 7.1.4 by Martin v. Loewis.
-  OpenUNIX/8.0.0| UnixWare/7.1.@<:@0-4@:>@)
-    define_xopen_source=no;;
-  # On OpenServer 5, u_short is never defined with _XOPEN_SOURCE,
-  # but used in struct sockaddr.sa_family. Reported by Tim Rice.
-  SCO_SV/3.2)
-    define_xopen_source=no;;
   # On MacOS X 10.2, a bug in ncurses.h means that it craps out if
   # _XOPEN_EXTENDED_SOURCE is defined. Apparently, this is fixed in 10.3, which
   # identifies itself as Darwin/7.*
@@ -2622,11 +2607,6 @@ then
 	    OPT="-O3 -Wall"
 	    ;;
 	esac
-
-	case $ac_sys_system in
-	    SCO_SV*) OPT="$OPT -m486 -DSCO5"
-	    ;;
-        esac
 	;;
 
     *)
@@ -2994,10 +2974,6 @@ AS_VAR_IF([ac_cv_gcc_compat], [yes], [
     esac
 
     case $ac_sys_system in
-	SCO_SV*)
-	    BASECFLAGS="$BASECFLAGS -m486 -DSCO5"
-	    ;;
-
     Darwin*)
         # -Wno-long-double, -no-cpp-precomp, and -mno-fused-madd
         # used to be here, but non-Apple gcc doesn't accept them.
@@ -3151,15 +3127,6 @@ AS_VAR_IF([ac_cv_gcc_compat], [yes], [
         # end of Darwin* tests
         ;;
     esac
-], [
-    case $ac_sys_system in
-    OpenUNIX*|UnixWare*)
-	BASECFLAGS="$BASECFLAGS -K pentium,host,inline,loop_unroll,alloca "
-	;;
-    SCO_SV*)
-	BASECFLAGS="$BASECFLAGS -belf -Ki486 -DSCO5"
-	;;
-    esac
 ])
 
 # Check for --enable-experimental-jit:
@@ -3542,13 +3509,6 @@ AC_DEFINE([_FILE_OFFSET_BITS], [64],
 [This must be set to 64 on some systems to enable large file support.])
 fi
 
-# Add some code to confdefs.h so that the test for off_t works on SCO
-cat >> confdefs.h <<\EOF
-#if defined(SCO_DS)
-#undef _OFF_T
-#endif
-EOF
-
 # Type availability checks
 AC_TYPE_MODE_T
 AC_TYPE_OFF_T
@@ -3967,17 +3927,6 @@ then
 	NetBSD*|DragonFly*)
 		LDSHARED='$(CC) -shared'
 		LDCXXSHARED='$(CXX) -shared';;
-	OpenUNIX*|UnixWare*)
-		if test "$ac_cv_gcc_compat" = "yes" ; then
-			LDSHARED='$(CC) -shared'
-			LDCXXSHARED='$(CXX) -shared'
-		else
-			LDSHARED='$(CC) -G'
-			LDCXXSHARED='$(CXX) -G'
-		fi;;
-	SCO_SV*)
-		LDSHARED='$(CC) -Wl,-G,-Bexport'
-		LDCXXSHARED='$(CXX) -Wl,-G,-Bexport';;
 	WASI*)
 		AS_VAR_IF([enable_wasm_dynamic_linking], [yes], [
 			dnl not implemented yet
@@ -4025,16 +3974,6 @@ then
 		]);;
 	FreeBSD*|NetBSD*|OpenBSD*|DragonFly*) CCSHARED="-fPIC";;
 	Haiku*) CCSHARED="-fPIC";;
-	OpenUNIX*|UnixWare*)
-		if test "$ac_cv_gcc_compat" = "yes"
-		then CCSHARED="-fPIC"
-		else CCSHARED="-KPIC"
-		fi;;
-	SCO_SV*)
-		if test "$ac_cv_gcc_compat" = "yes"
-		then CCSHARED="-fPIC"
-		else CCSHARED="-Kpic -belf"
-		fi;;
 	VxWorks*)
 		CCSHARED="-fpic -D__SO_PICABILINUX__  -ftls-model=global-dynamic"
 	esac
@@ -4085,9 +4024,6 @@ then
 			fi
 		fi
 		;;
-	OpenUNIX*|UnixWare*) LINKFORSHARED="-Wl,-Bexport";;
-	SCO_SV*) LINKFORSHARED="-Wl,-Bexport";;
-	ReliantUNIX*) LINKFORSHARED="-W1 -Blargedynsym";;
 	FreeBSD*|NetBSD*|OpenBSD*|DragonFly*)
 		if [[ "`$CC -dM -E - </dev/null | grep __ELF__`" != "" ]]
 		then
@@ -6364,8 +6300,7 @@ AS_VAR_IF([ac_cv_device_macros], [yes], [
 
 dnl no longer used, now always defined for backwards compatibility
 AC_DEFINE([SYS_SELECT_WITH_SYS_TIME], [1],
-  [Define if  you can safely include both <sys/select.h> and <sys/time.h>
-   (which you can't on SCO ODT 3.0).])
+  [Define if  you can safely include both <sys/select.h> and <sys/time.h>])
 
 # On OSF/1 V5.1, getaddrinfo is available, but a define
 # for [no]getaddrinfo in netdb.h.

diff --git a/pyconfig.h.in b/pyconfig.h.in
@@ -1922,8 +1922,7 @@
 /* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
 
-/* Define if you can safely include both <sys/select.h> and <sys/time.h>
-   (which you can't on SCO ODT 3.0). */
+/* Define if you can safely include both <sys/select.h> and <sys/time.h> */
 #undef SYS_SELECT_WITH_SYS_TIME
 
 /* Custom thread stack size depending on chosen sanitizer runtimes. */
@@ -2233,10 +2232,5 @@
 #undef uid_t
 
 
-/* Define the macros needed if on a UnixWare 7.x system. */
-#if defined(__USLC__) && defined(__SCO_VERSION__)
-#define STRICT_SYSV_CURSES /* Don't use ncurses extensions */
-#endif
-
 #endif /*Py_PYCONFIG_H*/
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		Remove dead build and preprocessor code for SCO UnixWare, OpenUNIX, SCO
		OpenServer and ReliantUNIX.