🚀 go-pugleaf

Hello,
    I am running Ultrix 4.2a on a DecStation 5000/25.  When I try to install
version 1.9, nothing works at all.  The first thing that happens when I type
make is the line
        gcc -O -g -c grpof.c -o gprof.o
which ends up with
gprof.c: In function `read_header_info':
gprof.c:902: storage size of `hdr' isn't known
gprof.c: In function `read_syms':
gprof.c:2000: structure has no member named `n_un'
gprof.c:2000: structure has no member named `n_un'
gprof.c:2011: structure has no member named `n_un'
gprof.c: In function `badsym':
gprof.c:2068: `N_EXT' undeclared (first use this function)
gprof.c:2068: (each undeclared identifier is reported only once
gprof.c:2068: for each function it appears in.)
gprof.c:2068: `N_EXT' undeclared (first use this function)
gprof.c:2077: structure has no member named `n_un'
gprof.c:2077: structure has no member named `n_un'
gprof.c: In function `get_ticks':
gprof.c:2315: structure has no member named `n_un'
gprof.c:2318: structure has no member named `n_un'
make: *** [gprof.o] Error 1

Any ideas?
Jeff Smith