Likewise, compiling GNU Mailutils 2.1 with Guile 1.9.2 leads to this:

#v+
mu_guile.c: In function ‘mu_guile_init’:
mu_guile.c:111: error: ‘SCM_DEVAL_P’ undeclared (first use in this function)
mu_guile.c:111: error: (Each undeclared identifier is reported only once
mu_guile.c:111: error: for each function it appears in.)
mu_guile.c:112: error: ‘SCM_BACKTRACE_P’ undeclared (first use in this function)
mu_guile.c:113: error: ‘SCM_RECORD_POSITIONS_P’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_ENTER_FRAME_P’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_BREAKPOINTS_P’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_ENTER_FRAME_HDLR’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_APPLY_FRAME_P’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_TRACE_P’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_APPLY_FRAME_HDLR’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_EXIT_FRAME_P’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_EXIT_FRAME_HDLR’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_MEMOIZE_P’ undeclared (first use in this function)
mu_guile.c:114: error: ‘SCM_MEMOIZE_HDLR’ undeclared (first use in this function)
#v-

Ludo'.