Symbol Referencing Error in Fortran 90

[student]

while compiling on:

SunOS 5.8 Generic_108528-27 sun4u sparc SUNW,Sun-Fire-280R

I get the following error:

Undefined                       first referenced
 symbol                             in file
matrixi_                            tst.o
ld: fatal: Symbol referencing errors. No output written to a.out

However, the compilation is successful when linking is suppressed. Can
anyone help me get rid of this error..

Compiling with the verbose option gives the following message:

###     command line files and options (expanded):
### -v tst.f90
### f90: Note: LM_LICENSE_FILE = (null)
### f90: Note: NLSPATH =
/local/SUNWspro/bin/../WS6U2/bin/../lib/locale/%L/LC_MESSAGES/%N.cat:/local/SUNWspro/bin/../WS6U2/bin/../../lib/locale/%L/LC_MESSAGES/%N.cat
/local/SUNWspro/bin/../WS6U2/bin/f90comp -y-o -ytst.o -ev
-y-ftrap=common -m3 -dq -y-fbe -y/local/SUNWspro/bin/../WS6U2/bin/fbe
-y-xarch=generic -y-s -H "/local/SUNWspro/bin/../WS6U2/bin/f90 -v "
-y-xcache=generic -xcache=generic
-I/local/SUNWspro/WS6U2/include/f90/v8 -p/local/SUNWspro/WS6U2/lib
-y-verbose -xall tst.f90
### f90: Note: LD_LIBRARY_PATH = (null)
### f90: Note: LD_RUN_PATH     = (null)
### f90: Note: LD_OPTIONS = (null)
/usr/ccs/bin/ld -t -R/local/SUNWspro/lib:/opt/SUNWspro/lib -o a.out
/local/SUNWspro/WS6U2/lib/crti.o /local/SUNWspro/WS6U2/lib/crt1.o
/local/SUNWspro/WS6U2/lib/values-xi.o -Y
P,/local/SUNWspro/lib:/local/SUNWspro/WS6U2/lib:/usr/ccs/lib:/usr/lib
tst.o -lfui -lfai -lfai2 -lfsumai -lfprodai -lfminlai -lfmaxlai
-lfminvai -lfmaxvai -lfsu -lsunmath -lm -lc
/local/SUNWspro/WS6U2/lib/crtn.o
Undefined                       first referenced
 symbol                             in file
matrixi_                            tst.o
ld: fatal: Symbol referencing errors. No output written to a.out
rm tst.o