In reply to @aleksana:mozilla.org
And bash in bootstrap-tools links against readline. Yes, I know this should not happen, because we use bashNonInteractive, but, it happens

In reply to @grimmauld:grapevine.grimmauld.de
https://github.com/NixOS/nixpkgs/pull/379368
probably this?

In reply to @aleksana:mozilla.org
There's something going wrong with gettext and glibc iconv (checking for working iconv...no and iconv_ostream__flush has incompatible pointer type)

This is the part of the "checking for working iconv" test that fails

#include <iconv.h>
#include <string.h>

int
main (void)
{
int result = 0;

  /* Test against HP-UX 11.11 bug: No converter from EUC-JP to UTF-8 is
     provided.  */
  {
    /* Try standardized names.  */
    iconv_t cd1 = iconv_open ("UTF-8", "EUC-JP");
    /* Try IRIX, OSF/1 names.  */
    iconv_t cd2 = iconv_open ("UTF-8", "eucJP");
    /* Try AIX names.  */
    iconv_t cd3 = iconv_open ("UTF-8", "IBM-eucJP");
    /* Try HP-UX names.  */
    iconv_t cd4 = iconv_open ("utf8", "eucJP");
    if (cd1 == (iconv_t)(-1) && cd2 == (iconv_t)(-1)
        && cd3 == (iconv_t)(-1) && cd4 == (iconv_t)(-1))
      result |= 16;
    if (cd1 != (iconv_t)(-1))
      iconv_close (cd1);
    if (cd2 != (iconv_t)(-1))
      iconv_close (cd2);
    if (cd3 != (iconv_t)(-1))
      iconv_close (cd3);
    if (cd4 != (iconv_t)(-1))
      iconv_close (cd4);
  }
  return result;

  ;
  return 0;
}

Looks like something related to locales which we don't install in bootstrapTools...