Add "-j1" (sequential) option to several packages "make" since their Makefile...

Add "-j1" (sequential) option to several packages "make" since their Makefile doesn't work in parallel.

packages/bacon.rb

@@ -9,7 +9,9 @@ class Bacon < Package
     system "./configure --prefix=/usr/local --without-gui"
     system 'sed -i "45s,/usr/share,/usr/local/share," Makefile'
     system 'sed -i "46s,/usr/share,/usr/local/share," Makefile'
-    system "make"
+
+    # force to compile in sequential since bacon Makefile doesn't work in parallel
+    system "make", "-j1"
   end
 
   def self.install

packages/ffcall.rb

@@ -7,7 +7,9 @@ class Ffcall < Package
 
   def self.build
     system "./configure --prefix=/usr/local CFLAGS=\" -fPIC\""
-    system "make"
+
+    # force to compile in sequential since ffcall Makefile doesn't work in parallel
+    system "make", "-j1"
   end
 
   def self.install

packages/groff.rb

@@ -7,7 +7,9 @@ class Groff < Package
   
   def self.build
     system './configure'
-    system 'make'
+
+    # force to compile in sequential since groff Makefile doesn't work in parallel
+    system 'make', '-j1'
   end
   
   def self.install

packages/slang.rb

@@ -7,7 +7,9 @@ class Slang < Package
 
   def self.build
     system "./configure", "--prefix=/usr/local", "--without-x"
-    system "make"
+
+    # force to compile in sequential since slang Makefile doesn't work in parallel
+    system "make", "-j1"
   end
 
   def self.install

packages/unrar.rb

@@ -8,8 +8,10 @@ class Unrar < Package
   def self.build
     system "sed -i '145s,$,/libunrar.so,' makefile" # fix naming mistake
     system "sed -i '145s,install,install -D,' makefile" # create directory
-    system "make", "all"
-    system "make", "lib"
+
+    # force to compile in sequential since unrar Makefile doesn't work in parallel
+    system "make", "-j1", "all"
+    system "make", "-j1", "lib"
   end
 
   def self.install