Use system libminizip (zlib) wrt http://bugs.gentoo.org/407269.
Use system libunrar. Use CXX and CXXFLAGS instead of CC and CFLAGS for g++.
Stop using passing libraries from LDFLAGS and use LDLIBS instead.

--- Makefile
+++ Makefile
@@ -1,5 +1,5 @@
-CC = `wx-config --cxx`
-LDFLAGS = `wx-config --libs` -Lunrar -lunrar -Lunzip -lminiunzip
+CXX ?= `wx-config --cxx`
+LDLIBS = `wx-config --libs` -lunrar `pkg-config --libs minizip`
 INSTALL = install
 INSTALL_PROGRAM = $(INSTALL)
 prefix = /usr/local
@@ -12,18 +12,12 @@
 
 all: comical
 
-comical: $(OBJS) unrar/libunrar.a unzip/libminiunzip.a
-	$(CC) -o $@ $(OBJS) $(LDFLAGS)
+comical: $(OBJS)
+	$(CXX) $(LDFLAGS) $(CXXFLAGS) -o $@ $(OBJS) $(LDLIBS)
 
 $(OBJS):
 	$(MAKE) -C src
 
-unrar/libunrar.a:
-	$(MAKE) lib -C unrar -f makefile.linux
-
-unzip/libminiunzip.a:
-	$(MAKE) -C unzip
-
 install: comical
 	$(INSTALL_PROGRAM) comical $(DESTDIR)$(bindir)/comical
 
@@ -39,8 +33,6 @@
 
 distclean:
 	$(MAKE) clean
-	$(MAKE) clean -C unrar -f makefile.linux
-	$(MAKE) clean -C unzip
 	rm -f $(DEPS) bin2h src/bin2h.o
 
 .PHONY : install install-strip uninstall clean distclean
--- src/ComicBookRAR.h
+++ src/ComicBookRAR.h
@@ -29,7 +29,7 @@
 #define _ComicBookRAR_h_
 
 #include "ComicBook.h"
-#include "dll.hpp"
+#include <dll.hpp>
  
 class ComicBookRAR : public ComicBook {
 
--- src/ComicBookZIP.cpp
+++ src/ComicBookZIP.cpp
@@ -27,7 +27,7 @@
 
 #include "ComicBookZIP.h"
 #include <wx/mstream.h>
-#include "unzip.h"
+#include <unzip.h>
 #include "Exceptions.h"
 #include <cstring>
 #include <errno.h>
--- src/Makefile
+++ src/Makefile
@@ -1,6 +1,5 @@
-INCLUDE = -I../unrar -I../unzip
-CFLAGS = -O2 -Wall -pipe
-CPPFLAGS = `wx-config --cxxflags` $(CFLAGS) -D_UNIX $(INCLUDE)
+CXXFLAGS += -Wall `wx-config --cxxflags` `pkg-config --cflags minizip` -I/usr/include/libunrar
+CPPFLAGS += -D_UNIX $(CXXFLAGS)
 
 .SUFFIXES: .cpp .png .h .d .o
 
@@ -21,11 +20,11 @@
 	@echo -e "};\n\n#endif" >> $@
 
 %.o : %.cpp
-	$(CC) $(CPPFLAGS) -c -o $*.o $<
+	$(CXX) $(CPPFLAGS) -c -o $*.o $<
 
 %.d : %.cpp
 	@set -e; rm -f $@; \
-	 $(CC) -MM -MG $(CPPFLAGS) -MT '$*.o' $< > $@.$$$$; \
+	 $(CXX) -MM -MG $(CPPFLAGS) -MT '$*.o' $< > $@.$$$$; \
 	 sed 's,\($*\)\.o[ :]*,\1.o $@ : ,g' < $@.$$$$ > $@; \
 	 rm -f $@.$$$$