Hi Jeremy, With the conversion to Debhelper compat level 9, multiarch directories are passed when running dh_auto_configure for --libdir and --libexecdir, so the paths used to install the files needs some adjustment.
Attached is proposed debdiff. Regards, Salvatore
diff -Nru libesmtp-1.0.6/debian/changelog libesmtp-1.0.6/debian/changelog --- libesmtp-1.0.6/debian/changelog 2014-06-24 04:34:57.000000000 +0200 +++ libesmtp-1.0.6/debian/changelog 2014-06-29 06:42:47.000000000 +0200 @@ -1,3 +1,13 @@ +libesmtp (1.0.6-2.1) unstable; urgency=medium + + * Non-maintainer upload. + * Fixes "libesmtp6: does not ship libesmtp.so.6". With Debhelper + compatibility level 9 the multiarch directories are used in particular for + dh_auto_configure for --libexecdir and --libdir. Adjust the paths used + for dh_movefiles to install the files (Closes: #753027). + + -- Salvatore Bonaccorso <car...@debian.org> Sun, 29 Jun 2014 06:42:43 +0200 + libesmtp (1.0.6-2) unstable; urgency=low * Update package to clean up lintian findings diff -Nru libesmtp-1.0.6/debian/libesmtp-dev.files libesmtp-1.0.6/debian/libesmtp-dev.files --- libesmtp-1.0.6/debian/libesmtp-dev.files 2014-05-29 05:36:09.000000000 +0200 +++ libesmtp-1.0.6/debian/libesmtp-dev.files 2014-06-29 06:37:26.000000000 +0200 @@ -1,5 +1,5 @@ -usr/lib/*.a +usr/lib/*/*.a usr/lib/esmtp/*.a -usr/lib/*.so +usr/lib/*/*.so usr/include usr/bin diff -Nru libesmtp-1.0.6/debian/libesmtp6.files libesmtp-1.0.6/debian/libesmtp6.files --- libesmtp-1.0.6/debian/libesmtp6.files 2014-05-29 05:36:09.000000000 +0200 +++ libesmtp-1.0.6/debian/libesmtp6.files 2014-06-29 06:37:38.000000000 +0200 @@ -1,2 +1,2 @@ -usr/lib/lib*.so.* +usr/lib/*/lib*.so.* usr/lib/esmtp/*.so