Passing '$'-sequences through unmodified?

[Philip A. Prindeville]

I have the following trivial automake sequence in

linux-atm-2.5.1/src/q2931/Makefile.am:

 14 NLS = atm_ai_msg atm_ai_ie atm_loc atm_cv atm_pu atm_na atm_cond atm_ie \
 15         atm_msg atm_np atm_ton atm_sat atm_prs atm_scrn atm_vpa atm_poe \
 16         q2931_cs atm_td atm_bc atm_tc atm_stc atm_upcc q2931_proto atm_flag 
    \
 17         atm_aalp atm_fd atm_tag atm_l2 atm_l3 atm_tt atm_mc atm_hl atm_imd \
 18         atm_tdl atm_tni atm_nip atm_shi atm_oci atm_unfm atm_ofi atm_irs \
 19         atm_it atm_lit atm_lsi atm_tcs atm_css atm_eqo atm_eqp atm_aap \
 20         atm_asp atm_tor
 21 SYMFILES = $(srcdir)/uni.h $(shell $(CC) $(CFLAGS) -E $(srcdir)/header.c | 
$    (AWK) -f $(srcdir)/script.awk)
 22 


but when I run automake on this, I get:

Running automake...
src/q2931/Makefile.am:21: shell $(CC: non-POSIX variable name
src/q2931/Makefile.am:21: (probably a GNU make extension)
src/qgen/Makefile.am:8: `CFLAGS' is a user variable, you should not override it;
src/qgen/Makefile.am:8: use `AM_CFLAGS' instead.
Finished...  Now run './configure' and 'make'...


The sequence:

$(shell $(CC) $(CFLAGS) -E $(srcdir)/header.c | $    (AWK) -f 
$(srcdir)/script.awk)

is perfectly valid gmake syntax.  Why is automake complaining about this?  And 
how do I get it to stop?

Oddly, automake ends up generating the correct output:

linux-atm-2.5.1/src/q2931/Makefile:

214 NLS = atm_ai_msg atm_ai_ie atm_loc atm_cv atm_pu atm_na atm_cond atm_ie \
215         atm_msg atm_np atm_ton atm_sat atm_prs atm_scrn atm_vpa atm_poe \
216         q2931_cs atm_td atm_bc atm_tc atm_stc atm_upcc q2931_proto atm_flag 
    \
217         atm_aalp atm_fd atm_tag atm_l2 atm_l3 atm_tt atm_mc atm_hl atm_imd \
218         atm_tdl atm_tni atm_nip atm_shi atm_oci atm_unfm atm_ofi atm_irs \
219         atm_it atm_lit atm_lsi atm_tcs atm_css atm_eqo atm_eqp atm_aap \
220         atm_asp atm_tor
221 
222 SYMFILES = $(srcdir)/uni.h $(shell $(CC) $(CFLAGS) -E $(srcdir)/header.c | 
$    (AWK) -f $(srcdir)/script.awk)
...


This is with 1.11.1 on Fedora 12.

Thanks.