Fix missing dependency on openmpi-bin for DEB packages.

(cherry picked from commit 5fa18d16)

pkg/CMakeLists.txt

@@ -54,6 +54,8 @@ if (NEKTAR_BUILD_UTILITIES)
 endif()
 
 if (NEKTAR_BUILD_LIBRARY AND DPKG)
+    set(NEK_DEP "openmpi-bin")
+
     ### DEBIAN PACKAGES ############################################
     # Note that the formatting of the DESCRIPTION field is VERY specific. It
     # must start with a new line, each line must start with a space, and there
@@ -65,8 +67,9 @@ if (NEKTAR_BUILD_LIBRARY AND DPKG)
         DESCRIPTION "
  This library provides core routines including linear algebra and integration
  with ThirdParty libraries."
+        DEPENDS "${NEK_DEP}"
         INSTALL_LIBS "${libnektar++-utilities_LIBS}")
-    set(NEK_DEP "libnektar++-utilities (= ${NEKTAR_VERSION})")
+    set(NEK_DEP "${NEK_DEP}, libnektar++-utilities (= ${NEKTAR_VERSION})")
 
     add_nektar_package(
         NAME libnektar++-stdregions