From 0b01920726661debbea836ba3ed0c2c27ff83364 Mon Sep 17 00:00:00 2001
From: Bill Somerville <g4wjs@classdesign.com>
Date: Thu, 9 Oct 2014 19:04:26 +0000
Subject: [PATCH] Only do package generation if appropriate tools are available

Debian packages are  only build if dpkg-buildpackage  is available and
RPM package generation is only done if rpmbuild is available.

Merged from wsjtx-1.4 branch.




git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@4504 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
---
 CMakeLists.txt | 38 +++++++++++++++++++++++---------------
 1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index fbef502bf..62310af99 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -969,22 +969,30 @@ if (WIN32)
 elseif (APPLE)
   set (CPACK_GENERATOR "DragNDrop")
 else ()
-  #
-  # Derive the correct filename for a Debian package because the DEB
-  # generator doesn't do this correctly at present.
-  #
-  find_program (DPKG_PROGRAM dpkg DOC "dpkg program of Debian-based systems")
-  if (DPKG_PROGRAM)
-    execute_process (
-      COMMAND ${DPKG_PROGRAM} --print-architecture
-      OUTPUT_VARIABLE CPACK_DEBIAN_PACKAGE_ARCHITECTURE
-      OUTPUT_STRIP_TRAILING_WHITESPACE
-      )
-  else (DPKG_PROGRAM)
-    set (CPACK_DEBIAN_PACKAGE_ARCHITECTURE noarch)
-  endif (DPKG_PROGRAM)
+  find_program (DPKG_BUILDER dpkg-buildpackage DOC "Debian package builder")
+  if (DPKG_BUILDER)
+    #
+    # Derive the correct filename for a Debian package because the DEB
+    # generator doesn't do this correctly at present.
+    #
+    find_program (DPKG_PROGRAM dpkg DOC "dpkg program of Debian-based systems")
+    if (DPKG_PROGRAM)
+      execute_process (
+	COMMAND ${DPKG_PROGRAM} --print-architecture
+	OUTPUT_VARIABLE CPACK_DEBIAN_PACKAGE_ARCHITECTURE
+	OUTPUT_STRIP_TRAILING_WHITESPACE
+	)
+    else (DPKG_PROGRAM)
+      set (CPACK_DEBIAN_PACKAGE_ARCHITECTURE noarch)
+    endif (DPKG_PROGRAM)
 
-  set (CPACK_GENERATOR "DEB" "RPM")
+    list (APPEND CPACK_GENERATOR "DEB")
+  endif (DPKG_BUILDER)
+
+  find_program (RPMBUILDER rpmbuild DOC "RPM package builder")
+  if (RPMBUILDER)
+    list (APPEND CPACK_GENERATOR "RPM")
+  endif (RPBUILDER)
 endif ()
 
 set (CPACK_DEBIAN_PACKAGE_DESCRIPTION "${PROJECT_DESCRIPTION}")