diff -ur krb5-1.19.1/src/config/shlib.conf krb5-1.19.1-qnx/src/config/shlib.conf
--- krb5-1.19.1/src/config/shlib.conf	2021-02-18 11:35:16.000000000 -0500
+++ krb5-1.19.1-qnx/src/config/shlib.conf	2021-03-31 18:19:25.224512455 -0400
@@ -541,6 +541,25 @@
 	RUN_ENV='LIBPATH=`echo $(PROG_LIBPATH) | sed -e "s/-L//g" -e "s/ /:/g"`:$(PROG_RPATH):/usr/lib:/usr/local/lib'
 	RUN_VARS='LIBPATH'
 	;;
+
+
+*-*-qnx*)
+	PICFLAGS=-shared
+	SHLIBVEXT='.so.$(LIBMAJOR).$(LIBMINOR)'
+	SHLIBSEXT='.so.$(LIBMAJOR)'
+	SHLIBEXT=.so
+	RPATH_FLAG='-Wl,-rpath -Wl,'
+	PROG_RPATH_FLAGS='$(RPATH_FLAG)$(PROG_RPATH)'
+	CC_LINK_SHARED='$(CC) $(PROG_LIBPATH) $(PROG_RPATH_FLAGS) $(CFLAGS) $(LDFLAGS)'
+	CXX_LINK_SHARED='$(CXX) $(PROG_LIBPATH) $(PROG_RPATH_FLAGS) $(CXXFLAGS) $(LDFLAGS)'
+	LDCOMBINE='$(CC) -shared -Wl,-h,$(LIBPREFIX)$(LIBBASE)$(SHLIBSEXT)'
+	SHLIB_RPATH_FLAGS='-Wl,-rpath -Wl,$(SHLIB_RDIRS)'
+	SHLIB_EXPFLAGS='$(SHLIB_RPATH_FLAGS) $(SHLIB_DIRS) $(SHLIB_EXPLIBS)'
+	RUN_ENV='LD_LIBRARY_PATH=`echo $(PROG_LIBPATH) | sed -e "s/-L//g" -e "s/ /:/g"`'
+	RUN_VARS='LD_LIBRARY_PATH'
+	PROFFLAGS=-pg
+	;;
+
 esac
 
 if test "${MAKE_SHLIB_COMMAND}" = "x" ; then
diff -ur krb5-1.19.1/src/kadmin/dbutil/dump.c krb5-1.19.1-qnx/src/kadmin/dbutil/dump.c
--- krb5-1.19.1/src/kadmin/dbutil/dump.c	2021-02-18 11:35:16.000000000 -0500
+++ krb5-1.19.1-qnx/src/kadmin/dbutil/dump.c	2021-03-31 18:13:51.604445353 -0400
@@ -37,6 +37,7 @@
 #if defined(HAVE_REGEX_H) && defined(HAVE_REGCOMP)
 #include <regex.h>
 #endif  /* HAVE_REGEX_H */
+#include <unix.h>
 
 /* Needed for master key conversion. */
 static krb5_boolean mkey_convert;
diff -ur krb5-1.19.1/src/kadmin/dbutil/kdb5_mkey.c krb5-1.19.1-qnx/src/kadmin/dbutil/kdb5_mkey.c
--- krb5-1.19.1/src/kadmin/dbutil/kdb5_mkey.c	2021-02-18 11:35:16.000000000 -0500
+++ krb5-1.19.1-qnx/src/kadmin/dbutil/kdb5_mkey.c	2021-03-31 18:13:51.604445353 -0400
@@ -27,6 +27,7 @@
 #ifdef POSIX_REGEXPS
 #include        <regex.h>
 #endif
+#include <unix.h>
 
 extern krb5_keyblock master_keyblock; /* current mkey */
 extern krb5_kvno   master_kvno;
diff -ur krb5-1.19.1/src/lib/crypto/builtin/aes/brg_endian.h krb5-1.19.1-qnx/src/lib/crypto/builtin/aes/brg_endian.h
--- krb5-1.19.1/src/lib/crypto/builtin/aes/brg_endian.h	2021-02-18 11:35:16.000000000 -0500
+++ krb5-1.19.1-qnx/src/lib/crypto/builtin/aes/brg_endian.h	2021-03-31 18:13:51.604445353 -0400
@@ -39,7 +39,7 @@
       defined( __CYGWIN32__ ) || defined( __DJGPP__ ) || defined( __osf__ )
 #  include <machine/endian.h>
 #elif defined( __linux__ ) || defined( __GNUC__ ) || defined( __GNU_LIBRARY__ )
-#  if !defined( __MINGW32__ ) && !defined( _AIX )
+#  if !defined( __MINGW32__ ) && !defined( _AIX ) && !defined( __QNX__ )
 #    include <endian.h>
 #    if !defined( __BEOS__ )
 #      include <byteswap.h>
diff -ur krb5-1.19.1/src/lib/kadm5/srv/svr_iters.c krb5-1.19.1-qnx/src/lib/kadm5/srv/svr_iters.c
--- krb5-1.19.1/src/lib/kadm5/srv/svr_iters.c	2021-02-18 11:35:16.000000000 -0500
+++ krb5-1.19.1-qnx/src/lib/kadm5/srv/svr_iters.c	2021-03-31 18:13:51.604445353 -0400
@@ -26,6 +26,7 @@
 #include        <regex.h>
 #endif
 #include <stdlib.h>
+#include        <unix.h>
 
 #include        "server_internal.h"
 
diff -ur krb5-1.19.1/src/lib/rpc/auth_gssapi.c krb5-1.19.1-qnx/src/lib/rpc/auth_gssapi.c
--- krb5-1.19.1/src/lib/rpc/auth_gssapi.c	2021-02-18 11:35:16.000000000 -0500
+++ krb5-1.19.1-qnx/src/lib/rpc/auth_gssapi.c	2021-03-31 18:13:51.604445353 -0400
@@ -5,7 +5,7 @@
 
 #include <stdio.h>
 #include <string.h>
-#include <sys/errno.h>
+#include <errno.h>
 
 #include <gssapi/gssapi.h>
 #include <gssapi/gssapi_generic.h>
diff -ur krb5-1.19.1/src/lib/rpc/bindresvport.c krb5-1.19.1-qnx/src/lib/rpc/bindresvport.c
--- krb5-1.19.1/src/lib/rpc/bindresvport.c	2021-02-18 11:35:16.000000000 -0500
+++ krb5-1.19.1-qnx/src/lib/rpc/bindresvport.c	2021-03-31 18:13:51.604445353 -0400
@@ -37,7 +37,6 @@
 #include <stdint.h>
 #include <unistd.h>
 #include <sys/types.h>
-#include <sys/errno.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <gssrpc/rpc.h>
diff -ur krb5-1.19.1/src/lib/rpc/clnt_generic.c krb5-1.19.1-qnx/src/lib/rpc/clnt_generic.c
--- krb5-1.19.1/src/lib/rpc/clnt_generic.c	2021-02-18 11:35:16.000000000 -0500
+++ krb5-1.19.1-qnx/src/lib/rpc/clnt_generic.c	2021-03-31 18:13:51.604445353 -0400
@@ -40,7 +40,7 @@
 #include <string.h>
 #include <gssrpc/rpc.h>
 #include <sys/socket.h>
-#include <sys/errno.h>
+#include <errno.h>
 #include <netdb.h>
 
 /*