Fix up usage of MANPREFIX

src/syncterm/GNUmakefile

@@ -19,9 +19,9 @@ DESKTOPDIR ?= $(PREFIX)/share/applications
 
 CFLAGS	+=	-DPREFIX=\"${PREFIX}\"
 ifeq ($(PREFIX),/usr)
- MANPREFIX ?= /usr/share/man
+ MANPREFIX ?= /usr/share
 else
- MANPREFIX ?= $(PREFIX)/man
+ MANPREFIX ?= $(PREFIX)
 endif
 
 CFLAGS	+=	$(UIFC-MT_CFLAGS) $(CIOLIB-MT_CFLAGS) $(XPDEV-MT_CFLAGS) -I../sbbs3 -I../smblib -I../comio
@@ -51,7 +51,7 @@ syncterm.1.gz: syncterm.man
 installdirs:
 	-mkdir -p ${PREFIX}/bin
 	-mkdir -p ${DESKTOPDIR}
-	-mkdir -p ${MANPREFIX}/man1
+	-mkdir -p ${MANPREFIX}/man/man1
 	-mkdir -p ${PREFIX}/share/icons/hicolor/64x64/apps
 
 install: $(SYNCTERM) syncterm.1.gz installdirs
@@ -59,7 +59,7 @@ install: $(SYNCTERM) syncterm.1.gz installdirs
 	${INSTALL_EXE} ${SYNCTERM} ${PREFIX}/bin
 	${INSTALL_DATA} syncterm.png ${PREFIX}/share/icons/hicolor/64x64/apps
 	${INSTALL_DATA} syncterm.desktop ${DESKTOPDIR}
-	${INSTALL_DATA} syncterm.1.gz ${MANPREFIX}/man1
+	${INSTALL_DATA} syncterm.1.gz ${MANPREFIX}/man/man1
 
 devel: tags cscope.out