--- libmopac7.pc.in.orig	2007-12-29 19:50:10.000000000 -0800
+++ libmopac7.pc.in	2007-12-23 12:48:12.000000000 -0800
@@ -4,4 +4,4 @@
 Name: libmopac7
 Description: A library for semi-empirical QM calculations.
 Version: @VERSION@
-Libs: -L${libdir} -lmopac7 -lg2c
+Libs: -L${libdir} -lmopac7 -lf2c

--- Makefile.in.orig	2007-12-22 19:41:20.000000000 -0800
+++ Makefile.in	2007-12-23 13:13:58.000000000 -0800
@@ -292,6 +292,7 @@
 	      || exit 1; \
 	  fi; \
 	done
+commons.lo commons.o : commons.c f2c.h
 aababc.lo aababc.o : aababc.c f2c.h
 addfck.lo addfck.o : addfck.c f2c.h
 addhcr.lo addhcr.o : addhcr.c f2c.h

--- src_orig/libmopac7.c	2007-12-22 20:08:36.000000000 -0800
+++ src/libmopac7.c	2007-12-22 20:09:39.000000000 -0800
@@ -5,32 +5,32 @@
 
 /* these come from MOPAC7/compfg.c */
 
-struct {
+extern struct {
     integer natoms, labels[120], na[120], nb[120], nc[120];
 } geokst_;
 
 #define geokst_1 geokst_
 
-struct {
+extern struct {
     integer nvar, loc[720]	/* was [2][360] */, idumy;
     doublereal dumy[360];
 } geovar_;
 
 #define geovar_1 geovar_
 
-struct {
+extern struct {
     doublereal elect;
 } elect_;
 
 #define elect_1 elect_
 
-struct {
+extern struct {
     doublereal enuclr;
 } enuclr_;
 
 #define enuclr_1 enuclr_
 
-struct {
+extern struct {
     integer numat, nat[120], nfirst[120], nmidle[120], nlast[120], norbs, 
 	    nelecs, nalpha, nbeta, nclose, nopen, ndumy;
     doublereal fract;
@@ -38,7 +38,7 @@
 
 #define molkst_1 molkst_
 
-struct {
+extern struct {
     doublereal c__[90000], eigs[300], cbeta[90000], eigb[300];
 } vector_;
 
@@ -46,7 +46,7 @@
 
 /* these come from MOPAC7/force.c */
 
-struct {
+extern struct {
     doublereal grad[360], gnorm;
 } gradnt_;
 
@@ -54,7 +54,7 @@
 
 /* these come from MOPAC7/esp.c */
 
-union {
+extern union {
     struct {
 	doublereal potpt[150000]	/* was [3][50000] */, work1d[200000];
     } _1;
@@ -73,14 +73,14 @@
 #define work1_2 (work1_._2)
 #define work1_3 (work1_._3)
 
-struct {
+extern struct {
     doublereal xc, yc, zc, espnuc, espele;
     integer nesp;
 } potesp_;
 
 #define potesp_1 potesp_
 
-struct {
+extern struct {
     doublereal cespm2[90000]	/* was [300][300] */, sla[10], cespml[90000], 
 	    cesp[90000];
     integer inc[1800], nc, npr, is, ip, ipc, isc, icd, iorb;

--- src_orig/Makefile.in	2007-12-23 13:13:58.000000000 -0800
+++ src/Makefile.in	2007-12-23 13:13:58.000000000 -0800
@@ -111,7 +111,8 @@
 LDFLAGS = @LDFLAGS@
 LIBS = @LIBS@
 libmopac7_la_LIBADD = 
-libmopac7_la_OBJECTS =  aababc.lo addfck.lo addhcr.lo addnuc.lo \
+libmopac7_la_OBJECTS =  commons.lo \
+aababc.lo addfck.lo addhcr.lo addnuc.lo \
 analyt.lo anavib.lo axis.lo block.lo bonds.lo brlzon.lo btoc.lo \
 calpar.lo capcor.lo cdiag.lo chrge.lo cnvg.lo compfg.lo consts.lo \
 cqden.lo datin.lo dcart.lo delmol.lo delri.lo denrot.lo densit.lo \
@@ -312,6 +313,7 @@
 	    || cp -p $$d/$$file $(distdir)/$$file || :; \
 	  fi; \
 	done
+commons.lo commons.o : commons.c
 aababc.lo aababc.o : aababc.c
 addfck.lo addfck.o : addfck.c
 addhcr.lo addhcr.o : addhcr.c

--- src_orig/Makefile.am	2007-09-21 09:58:15.000000000 -0700
+++ src/Makefile.am	2007-12-23 12:47:55.000000000 -0800
@@ -3,6 +3,7 @@
 libmopac7_la_LDFLAGS = -version-info 1:13:0
 
 libmopac7_la_SOURCES = \
+        commons.c \
 		aababc.c addfck.c addhcr.c addnuc.c analyt.c \
 		anavib.c axis.c block.c bonds.c brlzon.c \
 		btoc.c calpar.c capcor.c cdiag.c chrge.c \