debian/changelog

 hdf5 (1.10.4+repack-2) UNRELEASED; urgency=medium
 
   * Drop transitional package libhdf5-serial-dev (closes: #878535)
+  * Fix pkg-config files which contained wrong, old version numbers
+    (thanks to Elias Kuthe)
 
   * Acknowledging fixed CVE in previous releases:
     - Fixed in upstream release 1.10.2 (closes: #884365):

debian/hdf5-mpich.pc

 Name: HDF5
 Description: Hierarchical Data Format 5 (HDF5) - MPICH version
-Version: 1.8.13
+Version: @VERSION@
 Requires: mpich
 Cflags: -I/usr/include/hdf5/mpich
 Libs: -L/usr/lib/@MULTIARCH@/hdf5/mpich -lhdf5

debian/hdf5-openmpi.pc

 Name: HDF5
 Description: Hierarchical Data Format 5 (HDF5) - OpenMPI version
-Version: 1.8.13
+Version: @VERSION@
 Requires:
 Cflags: -I/usr/include/openmpi -I/usr/include/hdf5/openmpi
 Libs: -L/usr/lib/@MULTIARCH@/hdf5/openmpi -lhdf5 -L/usr/lib/openmpi/lib -lmpi

debian/hdf5-serial.pc

 Name: HDF5
 Description: Hierarchical Data Format 5 (HDF5)
-Version: 1.8.13
+Version: @VERSION@
 Requires:
 Cflags: -I/usr/include/hdf5/serial
 Libs: -L/usr/lib/@MULTIARCH@/hdf5/serial -lhdf5

debian/rules

@@ -262,7 +262,9 @@ dh_install_%: devpkg = $(package)$(flavorpkg)-dev
 dh_install_%:
 	dh_install $(foreach pkg,$(PACKAGES_$(flavor)),-p$(pkg)) --sourcedir=$(destdir)
 	install -d debian/$(devpkg)/usr/lib/$(DEB_HOST_MULTIARCH)/pkgconfig
-	sed 's/@MULTIARCH@/$(DEB_HOST_MULTIARCH)/g' debian/hdf5-$(flavor).pc >debian/$(devpkg)/usr/lib/$(DEB_HOST_MULTIARCH)/pkgconfig/hdf5-$(flavor).pc
+	sed -e 's/@MULTIARCH@/$(DEB_HOST_MULTIARCH)/g' \
+		-e 's/@VERSION@/$(libversion)/g' \
+		debian/hdf5-$(flavor).pc >debian/$(devpkg)/usr/lib/$(DEB_HOST_MULTIARCH)/pkgconfig/hdf5-$(flavor).pc
 
 override_dh_install-arch: $(foreach flavor,$(FLAVORS),dh_install_$(flavor))
 	find debian/$(serpack)/usr/lib -name '*cpp*' -delete