building v2.19.83 - can't find libguile.so.17

[Bric]

i am building lilypond-2.19.83 on Ubuntu 18.04.2 LTS

had to build guile-1.8.8, after which lilypond ./configure was happy, and finished (posted about my guile struggles a few days ago)

But "make" errors out with:

cat Documentation/out/generate-documentation.log :

<build root>/lilypond-2.19.83/out/bin/lilypond: error while loading shared libraries: libguile.so.17: cannot open shared object file: No such file or directory

i built guile to /usr/local/lib, and have a symlink with the above file name lilypond can't find

 ls -l /usr/local/lib/libguile.so.17*

lrwxrwxrwx 1 root root 18 Jan 18 23:54 /usr/local/lib/libguile.so.17 -> libguile.so.17.4.0
-rwxr-xr-x 1 root root 4607496 Jan 18 23:54 /usr/local/lib/libguile.so.17.4.0

guile-config link :

-pthread -L/usr/local/lib -lguile -lltdl -lgmp -lcrypt -lm -lltdl

how can i make lilypond find the shared object?