diff --git a/configure.ac b/configure.ac
index 7045a2f..8fb077e 100644
--- a/configure.ac
+++ b/configure.ac
@@ -14,10 +14,10 @@ AC_PROG_CC_C99
 LT_INIT([pic-only])
 
 # Checks for libraries.
-AC_SEARCH_LIBS([pari_init], [pari], [], [AC_MSG_ERROR([unable to find the pari_init() function from libpari])])
+AC_SEARCH_LIBS([gcry_check_version], [gcrypt], [], [AC_MSG_ERROR([unable to find the gcry_check_version() function from libgcrypt])])
 
 # Checks for header files.
-AC_CHECK_HEADER(pari/pari.h, [], [AC_MSG_ERROR([unable to find the pari.h header file from libpari])], [])
+AC_CHECK_HEADER(gcrypt.h, [], [AC_MSG_ERROR([unable to find the gcrypt.h header file from libgcrypt])], [])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_TYPE_SIZE_T