https://bugs.gentoo.org/385775

utilize $SYSROOT to find the right includedir tree

drop the -L/-R paths since we know our libdir is the standard path which
the compiler already knows how to locate
--- a/apr-config.in
+++ b/apr-config.in
@@ -27,8 +27,8 @@ bindir="@bindir@"
 libdir="@libdir@"
 datarootdir="@datadir@"
 datadir="@datadir@"
-installbuilddir="@installbuilddir@"
-includedir="@includedir@"
+installbuilddir="${SYSROOT}@installbuilddir@"
+includedir="${SYSROOT}@includedir@"
 
 CC="@CC@"
 CPP="@CPP@"
@@ -199,7 +199,7 @@ while test $# -gt 0; do
     --link-ld)
     if test "$location" = "installed"; then
         ### avoid using -L if libdir is a "standard" location like /usr/lib
-        flags="$flags -L$libdir -l${APR_LIBNAME}"
+        flags="$flags -l${APR_LIBNAME}"
     elif test "$location" = "crosscompile"; then
         flags="$flags -L$APR_TARGET_DIR/$libdir -l${APR_LIBNAME}"
     else
@@ -218,7 +218,7 @@ while test $# -gt 0; do
         ### avoid using -L if libdir is a "standard" location like /usr/lib
         # Since the user is specifying they are linking with libtool, we
         # *know* that -R will be recognized by libtool.
-        flags="$flags -L$libdir -R$libdir -l${APR_LIBNAME}"
+        flags="$flags -l${APR_LIBNAME}"
     elif test "$location" = "crosscompile"; then
         flags="$flags  -L${APR_TARGET_DIR}/$libdir  -l${APR_LIBNAME}"
     else