--- guix-1.5.0/m4/guix.m4
+++ guix-1.5.0/m4/guix.m4
@@ -206,9 +206,17 @@
   AC_CACHE_CHECK([whether Guile-Gcrypt is available and recent enough],
     [guix_cv_have_recent_guile_gcrypt],
     [GUILE_CHECK([retval],
-      [(use-modules (gcrypt hash))
-       (equal? (hash-algorithm sha256)
-               (lookup-hash-algorithm 'sha256))])
+      [(eval-when (expand load eval)
+         (use-modules (gcrypt hash)
+                      (rnrs bytevectors)))
+       (let ((algorithm (lookup-hash-algorithm 'sha256)))
+         (and algorithm
+              (eq? 'sha256 (hash-algorithm-name algorithm))
+              (= 32 (hash-size algorithm))
+              (bytevector=?
+                (sha256 #vu8(97 98 99))
+                #vu8(186 120 22 191 143 1 207 234
+                     65 65 64 222 93 174 34 35
+                     176 3 97 163 150 23 122 156
+                     180 16 255 97 242 0 21 173))))])
      if test "$retval" = 0; then
        guix_cv_have_recent_guile_gcrypt="yes"
      else
--- guix-1.5.0/configure
+++ guix-1.5.0/configure
@@ -8378,7 +8378,15 @@
 
-  $GUILE -c "(use-modules (gcrypt hash))
-       (equal? (hash-algorithm sha256)
-               (lookup-hash-algorithm 'sha256))" > /dev/null 2>&1
+  $GUILE -c "(eval-when (expand load eval)
+         (use-modules (gcrypt hash)
+                      (rnrs bytevectors)))
+       (let ((algorithm (lookup-hash-algorithm 'sha256)))
+         (and algorithm
+              (eq? 'sha256 (hash-algorithm-name algorithm))
+              (= 32 (hash-size algorithm))
+              (bytevector=?
+                (sha256 #vu8(97 98 99))
+                #vu8(186 120 22 191 143 1 207 234
+                     65 65 64 222 93 174 34 35
+                     176 3 97 163 150 23 122 156
+                     180 16 255 97 242 0 21 173))))" > /dev/null 2>&1
   retval=$?