diff --git a/biology/mopac/Makefile b/biology/mopac/Makefile
index 71187b3240cd..6a48c12db050 100644
--- a/biology/mopac/Makefile
+++ b/biology/mopac/Makefile
@@ -10,23 +10,28 @@ PORTVERSION=	7.${MOPAC_SUBVERSION}
 PORTEPOCH=	1
 CATEGORIES=	biology
 MASTER_SITES=	${MASTER_SITE_SOURCEFORGE}
-MASTER_SITE_SUBDIR=     mopac7
+MASTER_SITE_SUBDIR=	mopac7
 DISTNAME=	mopac7-${MOPAC_SUBVERSION}
 EXTRACT_SUFX=	.tgz
 
 MAINTAINER=	ports@FreeBSD.org
 COMMENT=	Semi-empirical (MNDO, etc.) molecular orbital calculation
 
-BUILD_DEPENDS=  f2c:${PORTSDIR}/lang/f2c
-LIB_DEPENDS=    f2c:${PORTSDIR}/lang/f2c
+BUILD_DEPENDS=	f2c:${PORTSDIR}/lang/f2c
+LIB_DEPENDS=	f2c:${PORTSDIR}/lang/f2c
 
 MOPAC_SUBVERSION=	1.10
 WRKSRC=		${WRKDIR}/mopac7-${MOPAC_SUBVERSION}
-GNU_CONFIGURE=  yes
+GNU_CONFIGURE=	yes
 USE_GMAKE=	yes
 CONFIGURE_ENV+=	CFLAGS="-I${LOCALBASE}/include" LDFLAGS="-L${LOCALBASE}/lib"
 MAKE_ENV+=	CFLAGS="-I${LOCALBASE}/include" LDFLAGS="-L${LOCALBASE}/lib"
 
+post-patch:
+	@${REINPLACE_CMD} -e \
+		"s,pkgconfigdir = .*,pkgconfigdir = $$\{exec_prefix\}/libdata/pkgconfig," \
+		${WRKSRC}/Makefile.in
+
 post-install:
 	${INSTALL_SCRIPT} ${WRKSRC}/run_mopac7  ${PREFIX}/bin/mopac7
 .if !defined(NOPORTDOCS)
diff --git a/biology/mopac/pkg-plist b/biology/mopac/pkg-plist
index 1459d9f32fec..43e463b4fd1c 100644
--- a/biology/mopac/pkg-plist
+++ b/biology/mopac/pkg-plist
@@ -1,17 +1,18 @@
 bin/mopac7
 include/mopac7/libmopac7.h
-lib/libmopac7.so.0
-lib/libmopac7.la
 lib/libmopac7.a
-lib/pkgconfig/libmopac7.pc
+lib/libmopac7.la
+lib/libmopac7.so
+lib/libmopac7.so.0
+libdata/pkgconfig/libmopac7.pc
 %%PORTDOCS%%%%EXAMPLESDIR%%/test/1scf.dat
 %%PORTDOCS%%%%EXAMPLESDIR%%/test/elements.dat
-%%PORTDOCS%%%%EXAMPLESDIR%%/test/force.dat   
+%%PORTDOCS%%%%EXAMPLESDIR%%/test/force.dat
 %%PORTDOCS%%%%EXAMPLESDIR%%/test/geometry.dat
-%%PORTDOCS%%%%EXAMPLESDIR%%/test/keys.dat    
-%%PORTDOCS%%%%EXAMPLESDIR%%/test/nch34+.dat  
-%%PORTDOCS%%%%EXAMPLESDIR%%/test/oldgeo.dat  
-%%PORTDOCS%%%%EXAMPLESDIR%%/test/paras.dat   
+%%PORTDOCS%%%%EXAMPLESDIR%%/test/keys.dat
+%%PORTDOCS%%%%EXAMPLESDIR%%/test/nch34+.dat
+%%PORTDOCS%%%%EXAMPLESDIR%%/test/oldgeo.dat
+%%PORTDOCS%%%%EXAMPLESDIR%%/test/paras.dat
 %%PORTDOCS%%%%EXAMPLESDIR%%/test/test_cos.dat
 %%PORTDOCS%%%%EXAMPLESDIR%%/test/test_ef_.dat
 %%PORTDOCS%%%%EXAMPLESDIR%%/test/test_gre.dat
@@ -22,3 +23,4 @@ lib/pkgconfig/libmopac7.pc
 %%PORTDOCS%%%%EXAMPLESDIR%%/test/test_pol.OUT
 %%PORTDOCS%%@dirrm %%EXAMPLESDIR%%/test
 %%PORTDOCS%%@dirrm %%EXAMPLESDIR%%
+@dirrm include/mopac7