https://bugs.gentoo.org/811765
https://sources.debian.org/patches/apr-util/1.6.3-1/apu_config_dont_list_indep_libs.patch/

From: Peter Samuelson <peter@p12n.org>
Subject: Prevent recursive linking of dependent libraries by apr-util users.

--- a/apr-util.pc.in
+++ b/apr-util.pc.in
@@ -8,6 +8,7 @@ Name: APR Utils
 Description: Companion library for APR
 Version: @APRUTIL_DOTTED_VERSION@
 # assume that apr-util requires libapr of same major version
-Requires: apr-@APRUTIL_MAJOR_VERSION@
-Libs: -L${libdir} -l@APRUTIL_LIBNAME@ @LDADD_ldap@ @APRUTIL_EXPORT_LIBS@
+Requires.private: apr-@APRUTIL_MAJOR_VERSION@
+Libs: -L${libdir} -l@APRUTIL_LIBNAME@ @LDADD_ldap@
+Libs.private: @APRUTIL_EXPORT_LIBS@
 Cflags: -I${includedir}
--- a/apu-config.in
+++ b/apu-config.in
@@ -27,7 +27,7 @@ bindir="@bindir@"
 libdir="@libdir@"
 includedir="${SYSROOT}@includedir@"
 
-LIBS="@APRUTIL_EXPORT_LIBS@"
+LIBS=
 INCLUDES="@APRUTIL_INCLUDES@"
 LDFLAGS="@APRUTIL_LDFLAGS@"
 LDAP_LIBS="@LDADD_ldap@"