--- a/auto/depends.sh	2026-05-25 13:20:21.917190847 +0200
+++ b/auto/depends.sh	2026-05-25 13:22:04.733076267 +0200
@@ -171,18 +171,6 @@
 pkg-config --version >/dev/null 2>/dev/null; ret=$?; if [[ 0 -ne $ret ]]; then
     echo "Please install pkg-config"; exit $ret;
 fi
-which ls >/dev/null 2>/dev/null; ret=$?; if [[ 0 -ne $ret ]]; then
-    if [[ $OS_IS_CENTOS == YES ]]; then
-        echo "Please install which by:"
-        echo "  yum install -y which"
-    elif [[ $OS_IS_UBUNTU == YES ]]; then
-        echo "Please install which by:"
-        echo "  apt install -y which"
-    else
-        echo "Please install which"
-    fi
-    exit $ret;
-fi
 
 #####################################################################################
 # Try to load cache if exists /usr/local/srs-cache
@@ -636,7 +624,7 @@
 # live transcoding, ffmpeg-4.1, x264-core157, lame-3.99.5, libaacplus-2.0.2.
 #####################################################################################
 # Guess where is the ffmpeg.
-SYSTEMP_FFMPEG_BIN=`which ffmpeg`
+SYSTEMP_FFMPEG_BIN=`type -P ffmpeg`
 # Always link the ffmpeg tools if exists.
 if [[ -f $SYSTEMP_FFMPEG_BIN && ! -f ${SRS_OBJS}/ffmpeg/bin/ffmpeg ]]; then
     mkdir -p ${SRS_OBJS}/ffmpeg/bin &&
@@ -680,7 +668,7 @@
     fi
     # For cross-build.
     if [[ $SRS_CROSS_BUILD == YES ]]; then
-        TOOL_GCC_REALPATH=$(realpath $(which $SRS_TOOL_CC))
+        TOOL_GCC_REALPATH=$(realpath $(type -P $SRS_TOOL_CC))
         SRT_COMPILER_PREFIX=$(echo $TOOL_GCC_REALPATH |sed 's/-gcc.*$/-/')
         LIBSRT_OPTIONS="$LIBSRT_OPTIONS --with-compiler-prefix=$SRT_COMPILER_PREFIX"
     fi