In /usr/bin/pcre-config line 36:
case `uname -s` in
     ^--------^ SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
case $(uname -s) in


In /usr/bin/pcre-config line 52:
  -*=*) optarg=`echo "$1" | sed 's/[-_a-zA-Z0-9]*=//'` ;;
               ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
  -*=*) optarg=$(echo "$1" | sed 's/[-_a-zA-Z0-9]*=//') ;;


In /usr/bin/pcre-config line 64:
      echo $prefix
           ^-----^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
      echo "$prefix"


In /usr/bin/pcre-config line 71:
      echo $exec_prefix
           ^----------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
      echo "$exec_prefix"


In /usr/bin/pcre-config line 77:
      if test ${prefix}/include != /usr/include ; then
              ^-------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
      if test "${prefix}"/include != /usr/include ; then


In /usr/bin/pcre-config line 84:
        if test ${prefix}/include != /usr/include ; then
                ^-------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        if test "${prefix}"/include != /usr/include ; then


In /usr/bin/pcre-config line 94:
        echo $libS$libR -lpcreposix -lpcre
                  ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        echo $libS"$libR" -lpcreposix -lpcre


In /usr/bin/pcre-config line 101:
        echo $libS$libR -lpcre
                  ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        echo $libS"$libR" -lpcre


In /usr/bin/pcre-config line 108:
        echo $libS$libR -lpcre16
                  ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        echo $libS"$libR" -lpcre16


In /usr/bin/pcre-config line 115:
        echo $libS$libR -lpcre32
                  ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        echo $libS"$libR" -lpcre32


In /usr/bin/pcre-config line 122:
        echo $libS$libR -lpcrecpp -lpcre
                  ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        echo $libS"$libR" -lpcrecpp -lpcre

For more information:
  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...
  https://www.shellcheck.net/wiki/SC2006 -- Use $(...) notation instead of le...