I was interested in feature request
http://public.kitware.com/Bug/view.php?id=14769 and made a simple patch for
CPack RPM generator (attached).

-- 
Regards,
Evgeny Kalishenko
From 0f05b7863f5db20a9099bf1076df880d7bc68f65 Mon Sep 17 00:00:00 2001
From: evgenyk <ydgins...@gmail.com>
Date: Wed, 8 Oct 2014 21:39:19 +0400
Subject: [PATCH] Requires for pre(post) install scripts are implemented for
 RPM packager

---
 Modules/CPackRPM.cmake | 34 +++++++++++++++++++++++++++++++++-
 1 file changed, 33 insertions(+), 1 deletion(-)

diff --git a/Modules/CPackRPM.cmake b/Modules/CPackRPM.cmake
index 2864b21..27c5f51 100644
--- a/Modules/CPackRPM.cmake
+++ b/Modules/CPackRPM.cmake
@@ -135,6 +135,31 @@
 #
 #   rpm -qp --requires file.rpm
 #
+# .. variable:: CPACK_RPM_PACKAGE_REQUIRES_PRE
+#
+#  RPM spec requires(pre) field.
+#
+#  * Mandatory : NO
+#  * Default   : -
+#
+#  May be used to set RPM preinstall dependencies (requires(pre)).  Note that you must enclose
+#  the complete requires string between quotes, for example::
+#
+#   set(CPACK_RPM_PACKAGE_REQUIRES_PRE "shadow-utils, initscripts")
+#
+# .. variable:: CPACK_RPM_PACKAGE_REQUIRES_POST
+#
+#  RPM spec requires(post) field.
+#
+#  * Mandatory : NO
+#  * Default   : -
+#
+#  May be used to set RPM postinstall dependencies (requires(post)).  Note that you must enclose
+#  the complete requires string between quotes, for example::
+#
+#   set(CPACK_RPM_PACKAGE_REQUIRES_PRE "shadow-utils, initscripts")
+#
+#
 # .. variable:: CPACK_RPM_PACKAGE_SUGGESTS
 #
 #  RPM spec suggest field.
@@ -556,7 +581,7 @@ endif()
 # There may be some COMPONENT specific variables as well
 # If component specific var is not provided we use the global one
 # for each component
-foreach(_RPM_SPEC_HEADER URL REQUIRES SUGGESTS PROVIDES OBSOLETES PREFIX CONFLICTS AUTOPROV AUTOREQ AUTOREQPROV)
+foreach(_RPM_SPEC_HEADER URL REQUIRES SUGGESTS PROVIDES OBSOLETES PREFIX CONFLICTS AUTOPROV AUTOREQ AUTOREQPROV REQUIRES_PRE REQUIRES_POST)
     if(CPACK_RPM_PACKAGE_DEBUG)
       message("CPackRPM:Debug: processing ${_RPM_SPEC_HEADER}")
     endif()
@@ -595,6 +620,11 @@ foreach(_RPM_SPEC_HEADER URL REQUIRES SUGGESTS PROVIDES OBSOLETES PREFIX CONFLIC
     string(TOLOWER "${_PACKAGE_HEADER_TAIL}" _PACKAGE_HEADER_TAIL)
     string(SUBSTRING ${_RPM_SPEC_HEADER} 0 1 _PACKAGE_HEADER_NAME)
     set(_PACKAGE_HEADER_NAME "${_PACKAGE_HEADER_NAME}${_PACKAGE_HEADER_TAIL}")
+    # The following keywords require braces around the "pre" or "post" suffix in the final RPM spec file.
+    if("${_RPM_SPEC_HEADER}" MATCHES "REQUIRES_PRE"  OR  "${_RPM_SPEC_HEADER}" MATCHES "REQUIRES_POST")
+      string(REPLACE "_" "(" _PACKAGE_HEADER_NAME "${_PACKAGE_HEADER_NAME}")
+      set(_PACKAGE_HEADER_NAME "${_PACKAGE_HEADER_NAME})")
+    endif()
     if(CPACK_RPM_PACKAGE_DEBUG)
       message("CPackRPM:Debug: User defined ${_PACKAGE_HEADER_NAME}:\n ${CPACK_RPM_PACKAGE_${_RPM_SPEC_HEADER}_TMP}")
     endif()
@@ -991,6 +1021,8 @@ Group:          \@CPACK_RPM_PACKAGE_GROUP\@
 Vendor:         \@CPACK_RPM_PACKAGE_VENDOR\@
 \@TMP_RPM_URL\@
 \@TMP_RPM_REQUIRES\@
+\@TMP_RPM_REQUIRES_PRE\@
+\@TMP_RPM_REQUIRES_POST\@
 \@TMP_RPM_PROVIDES\@
 \@TMP_RPM_OBSOLETES\@
 \@TMP_RPM_CONFLICTS\@
-- 
1.8.1.4

-- 

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