Backtrace:
In ice-9/boot-9.scm:
   2836:4 19 (save-module-excursion #<procedure 555b6afa9120 at ice-…>)
  3564:26 18 (_)
In unknown file:
          17 (primitive-load-path "chickadee/image" #<procedure 555b…>)
In ice-9/boot-9.scm:
  3923:23 16 (_)
   3411:4 15 (define-module* _ #:filename _ #:pure _ #:version _ # _ …)
  3424:24 14 (_)
   222:29 13 (map1 (((chickadee graphics color)) ((chickadee # #)) …))
   222:29 12 (map1 (((chickadee graphics pixbuf)) ((chickadee # …)) …))
   222:29 11 (map1 (((chickadee image jpeg)) ((chickadee image #)) …))
   222:17 10 (map1 (((chickadee image png)) ((chickadee utils)) (#) …))
  3327:17  9 (resolve-interface (chickadee image png) #:select _ # _ …)
In ice-9/threads.scm:
    390:8  8 (_ _)
In ice-9/boot-9.scm:
  3253:13  7 (_)
In ice-9/threads.scm:
    390:8  6 (_ _)
In ice-9/boot-9.scm:
  3544:20  5 (_)
   2836:4  4 (save-module-excursion #<procedure 555b6b03ff00 at ice-…>)
  3564:26  3 (_)
In unknown file:
           2 (primitive-load-path "chickadee/image/png" #<procedure …>)
In chickadee/image/png.scm:
    67:14  1 (_)
In chickadee/config.scm:
     46:7  0 (dynamic-link* ("libpng"))

chickadee/config.scm:46:7: In procedure dynamic-link*:
could not find library ("libpng")