diff -Nrup a/src/libgcrypt-config.in b/src/libgcrypt-config.in
--- a/src/libgcrypt-config.in	2018-10-24 09:45:45.000000000 +0200
+++ b/src/libgcrypt-config.in	2023-05-05 18:29:12.747506494 +0200
@@ -154,7 +154,7 @@ if test "$echo_cflags" = "yes"; then
 
     tmp=""
     for i in $includes $cflags_final; do
-       if echo "$tmp" | fgrep -v -- "$i" >/dev/null; then
+       if echo "$tmp" | grep -F -v -- "$i" >/dev/null; then
            tmp="$tmp $i"
        fi
     done
@@ -175,7 +175,7 @@ if test "$echo_libs" = "yes"; then
 
     tmp=""
     for i in $libdirs $libs_final; do
-       if echo "$tmp" | fgrep -v -- "$i" >/dev/null; then
+       if echo "$tmp" | grep -F -v -- "$i" >/dev/null; then
            tmp="$tmp $i"
        fi
     done