# Note that this patch requires >=guile-3, so we apply it conditionally.
# https://lists.gnu.org/archive/html/guile-devel/2024-05/msg00012.html
#
# Fix compile and test failures due to bitvector API change.
# https://bugs.gentoo.org/877785
--- a/src/math/primes.scm	2024-05-23 19:26:16.757865343 -0400
+++ b/src/math/primes.scm	2024-05-23 19:28:20.797358650 -0400
@@ -114,7 +114,7 @@
 		      (set! prime:prime-sqr (* nexp nexp))
 		      (set! prime:sieve (make-bitvector nexp #f))
 		      (for-each (lambda (prime)
-				  (bitvector-set! prime:sieve prime #t))
+				  (bitvector-set-bit! prime:sieve prime))
 				primes)
 		      (set! prime:products (reverse (cons comp comps))))
 		     (else
@@ -132,7 +132,7 @@
 There is a slight chance, @code{(expt 2 (- prime:trials))}, that a 
 composite will return @code{#t}."
   (set! n (abs n))
-  (cond ((< n (bitvector-length prime:sieve)) (bitvector-ref prime:sieve n))
+  (cond ((< n (bitvector-length prime:sieve)) (bitvector-bit-set? prime:sieve n))
 	((even? n) #f)
 	((primes-gcd? n prime:products) #f)
 	((< n prime:prime-sqr) #t)