/usr/bin/sdl-config is in libsdl1.2-dev 1.2.15-8ubuntu1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60  | #!/bin/sh
prefix=/usr
exec_prefix=${prefix}
exec_prefix_set=no
libdir=${prefix}/lib/x86_64-linux-gnu
#usage="\
#Usage: sdl-config [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs]"
usage="\
Usage: sdl-config [--prefix[=DIR]] [--exec-prefix[=DIR]] [--version] [--cflags] [--libs] [--static-libs]"
if test $# -eq 0; then
      echo "${usage}" 1>&2
      exit 1
fi
while test $# -gt 0; do
  case "$1" in
  -*=*) optarg=`echo "$1" | LC_ALL="C" sed 's/[-_a-zA-Z0-9]*=//'` ;;
  *) optarg= ;;
  esac
  case $1 in
    --prefix=*)
      prefix=$optarg
      if test $exec_prefix_set = no ; then
        exec_prefix=$optarg
      fi
      ;;
    --prefix)
      echo $prefix
      ;;
    --exec-prefix=*)
      exec_prefix=$optarg
      exec_prefix_set=yes
      ;;
    --exec-prefix)
      echo $exec_prefix
      ;;
    --version)
      echo 1.2.15
      ;;
    --cflags)
      echo -I${prefix}/include/SDL -D_GNU_SOURCE=1 -D_REENTRANT
      ;;
    --libs)
      echo -L${prefix}/lib/x86_64-linux-gnu  -lSDL
      ;;
    --static-libs)
#    --libs|--static-libs)
      echo -L${prefix}/lib/x86_64-linux-gnu  -lSDL  -lpthread  -lm -ldl  -lasound -lm -ldl -lpthread -lpulse-simple -lpulse    -lX11 -lXext -L/usr/lib/x86_64-linux-gnu -lcaca -lpthread
      ;;
    *)
      echo "${usage}" 1>&2
      exit 1
      ;;
  esac
  shift
done
 |