Try again with gnuplot5

.travis.yml

@@ -21,10 +21,10 @@ matrix:
 #addons:
 #  apt: # apt-get for linux
 #    packages:
-#    - gnuplot>=4.7
+#    - gnuplot
 
 before_script: # homebrew for mac
-  - if [ $TRAVIS_OS_NAME = osx ]; then brew install gnuplot; else sudo apt-get install gnuplot>=4.7; fi
+  - if [ $TRAVIS_OS_NAME = osx ]; then brew install gnuplot; else sudo apt-get install gnuplot5; fi
 
 ## uncomment the following lines to override the default test script
 #script:

src/Gnuplot.jl

@@ -423,8 +423,8 @@ gp.dump()
   will be appended);
 """
 function data(data::Vararg{AbstractArray{T,1},N};
-                 name::Union{Void,String}=nothing,
-                 prefix::Union{Void,String}=nothing) where {T<:Number,N}
+              name::Union{Void,String}=nothing,
+              prefix::Union{Void,String}=nothing) where {T<:Number,N}
     p_.getProcOrStartIt()
     cur = p_.main.states[p_.main.curPos]
 

src/GnuplotInternals.jl

@@ -122,7 +122,7 @@ function checkGnuplotVersion()
         end
     end
 
-    if ver < v"4.6"
+    if ver < v"4.7"
         error("gnuplot ver. >= 4.7 is required, but " * string(ver) * " was found.")
     end
     log(1, "Found gnuplot version: " * string(ver))