diff -uNr groff-1.22.4/lib/vasnprintf.c groff-1.22.4.mod/lib/vasnprintf.c
--- groff-1.22.4/lib/vasnprintf.c	2018-12-23 17:34:16.000000000 +0300
+++ groff-1.22.4.mod/lib/vasnprintf.c	2021-09-30 20:22:47.817441906 +0300
@@ -4874,7 +4874,8 @@
 # if ! (((__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 3))        \
          && !defined __UCLIBC__)                                            \
         || (defined __APPLE__ && defined __MACH__)                          \
-        || (defined _WIN32 && ! defined __CYGWIN__))
+        || (defined _WIN32 && ! defined __CYGWIN__)                         \
+        || defined(__ANDROID__))
                 fbp[1] = '%';
                 fbp[2] = 'n';
                 fbp[3] = '\0';