Warning on OSX and Solaris with vignette build

[ellisp]

https://cran.r-project.org/web/checks/check_results_ggseas.html

Version: 0.5.1 
Check: re-building of vignette outputs 
Result: WARN 
    Error in re-building vignettes:
     ...
    Warning in engine$weave(file, quiet = quiet, encoding = enc) :
     Pandoc (>= 1.12.3) and/or pandoc-citeproc not available. Falling back to R Markdown v1.
    Quitting from lines 125-126 (ggsdc.Rmd) 
    Error: processing vignette 'ggsdc.Rmd' failed with diagnostics:
    Process terminated
    Execution halted 
Flavor: r-patched-solaris-x86

Version: 0.5.1 
Check: re-building of vignette outputs 
Result: WARN 
    Error in re-building vignettes:
     ...
    
    Backtrace for this error:
    #0 0x129b9e579
    #1 0x129b9d945
    #2 0x7fff93ac4529
    sh: line 1: 89501 Trace/BPT trap: 5 /Volumes/SSD-Data/Builds/R-dev-web/QA/Simon/packages/el-capitan-x86_64/Rlib/3.5/x13binary/bin/x13ashtml /var/folders/xn/m8dzdsgs7sg8q7jgflnqm8w80000gn/T//RtmppExnyS/x1315bc558df5aa/iofile -n -s 2> /dev/null
    dyld: lazy symbol binding failed: Symbol not found: _mkostemp
     Referenced from: /Volumes/SSD-Data/Builds/R-dev-web/QA/Simon/packages/el-capitan-x86_64/Rlib/3.5/x13binary/bin/../lib/libgfortran.3.dylib (which was built for Mac OS X 10.12)
     Expected in: /usr/lib/libSystem.B.dylib
    
    dyld: Symbol not found: _mkostemp
     Referenced from: /Volumes/SSD-Data/Builds/R-dev-web/QA/Simon/packages/el-capitan-x86_64/Rlib/3.5/x13binary/bin/../lib/libgfortran.3.dylib (which was built for Mac OS X 10.12)
     Expected in: /usr/lib/libSystem.B.dylib
    
    
    Program received signal SIGTRAP: Trace/breakpoint trap.
    
    Backtrace for this error:
    #0 0x125f5f579
    #1 0x125f5e945
    #2 0x7fff93ac4529
    Quitting from lines 125-126 (ggsdc.Rmd) 
    Error: processing vignette 'ggsdc.Rmd' failed with diagnostics:
    X-13 has returned a non-zero exist status, which means that the current spec file cannot be processed for an unknown reason.
    Execution halted 
Flavor: r-release-osx-x86_64

[ellisp]

Duplicate of #14