diff --git a/trunk/auto/auto_headers.sh b/trunk/auto/auto_headers.sh
index a0bf149b2..fa6a55e58 100755
--- a/trunk/auto/auto_headers.sh
+++ b/trunk/auto/auto_headers.sh
@@ -39,11 +39,6 @@ function srs_undefine_macro()
     echo "#define ${macro}_BOOL false" >> $file
 }
 
-# export the preset.
-echo "#undef SRS_EXPORT_LIBRTMP" >> $SRS_AUTO_HEADERS_H
-
-echo "" >> $SRS_AUTO_HEADERS_H
-
 #####################################################################################
 # generate auto headers file, depends on the finished of options.sh
 #####################################################################################
diff --git a/trunk/auto/options.sh b/trunk/auto/options.sh
index 35354c465..633eaad34 100755
--- a/trunk/auto/options.sh
+++ b/trunk/auto/options.sh
@@ -349,6 +349,13 @@ function parse_user_option() {
         --without-mips-ubuntu12)        SRS_CROSS_BUILD=NO          ;;
         --mips-ubuntu12)                if [[ $value == off ]]; then SRS_CROSS_BUILD=NO; else SRS_CROSS_BUILD=YES; fi    ;;
 
+        # Removed features.
+        --export-librtmp-project)       SRS_EXPORT_LIBRTMP_PROJECT=${value}     ;;
+        --export-librtmp-single)        SRS_EXPORT_LIBRTMP_SINGLE=${value}      ;;
+        --with-librtmp)                 SRS_LIBRTMP=YES             ;;
+        --without-librtmp)              SRS_LIBRTMP=NO              ;;
+        --librtmp)                      if [[ $value == off ]]; then SRS_LIBRTMP=NO; else SRS_LIBRTMP=YES; fi    ;;
+
         # Deprecated, might be removed in future.
         --with-nginx)                   SRS_NGINX=YES               ;;
         --without-nginx)                SRS_NGINX=NO                ;;
@@ -356,11 +363,6 @@ function parse_user_option() {
         --with-ffmpeg)                  SRS_FFMPEG_TOOL=YES         ;;
         --without-ffmpeg)               SRS_FFMPEG_TOOL=NO          ;;
         --ffmpeg-tool)                  if [[ $value == off ]]; then SRS_FFMPEG_TOOL=NO; else SRS_FFMPEG_TOOL=YES; fi    ;;
-        --export-librtmp-project)       SRS_EXPORT_LIBRTMP_PROJECT=${value}     ;;
-        --export-librtmp-single)        SRS_EXPORT_LIBRTMP_SINGLE=${value}      ;;
-        --with-librtmp)                 SRS_LIBRTMP=YES             ;;
-        --without-librtmp)              SRS_LIBRTMP=NO              ;;
-        --librtmp)                      if [[ $value == off ]]; then SRS_LIBRTMP=NO; else SRS_LIBRTMP=YES; fi    ;;
 
         # Ignore the options.
         --demo)                         echo "Ignore $option"       ;;
@@ -476,19 +478,16 @@ function apply_detail_options() {
     
     # if specified export single file, export project first.
     if [ $SRS_EXPORT_LIBRTMP_SINGLE != NO ]; then
-        echo "Warning: Ingore --export-librtmp-single"
-        SRS_EXPORT_LIBRTMP_SINGLE=NO
+        echo "Error: srs-librtmp is removed, please read https://github.com/ossrs/srs-librtmp/issues/32"; exit 1
     fi
 
     # disable almost all features for export srs-librtmp.
     if [ $SRS_EXPORT_LIBRTMP_PROJECT != NO ]; then
-        echo "Warning: Ingore --export-librtmp-project"
-        SRS_EXPORT_LIBRTMP_PROJECT=NO
+        echo "Error: srs-librtmp is removed, please read https://github.com/ossrs/srs-librtmp/issues/32"; exit 1
     fi
 
     if [[ $SRS_LIBRTMP != NO ]]; then
-        echo "Warning: Ingore --librtmp"
-        SRS_LIBRTMP=NO
+        echo "Error: srs-librtmp is removed, please read https://github.com/ossrs/srs-librtmp/issues/32"; exit 1
     fi
 
     if [[ $SRS_RESEARCH != NO ]]; then
diff --git a/trunk/src/app/srs_app_gb28181_stack.cpp b/trunk/src/app/srs_app_gb28181_stack.cpp
index 198a270c6..c5bcfda0c 100644
--- a/trunk/src/app/srs_app_gb28181_stack.cpp
+++ b/trunk/src/app/srs_app_gb28181_stack.cpp
@@ -23,8 +23,6 @@
 
 #include <srs_app_gb28181_stack.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <stdio.h>
 #include <stdlib.h>
 #include <iostream>  
@@ -1457,5 +1455,3 @@ void SrsSipStack::req_ptz(std::stringstream& ss, SrsSipRequest *req, uint8_t cmd
 
 }
 
-#endif
-
diff --git a/trunk/src/app/srs_app_gb28181_stack.hpp b/trunk/src/app/srs_app_gb28181_stack.hpp
index 67651e740..87e7e1509 100644
--- a/trunk/src/app/srs_app_gb28181_stack.hpp
+++ b/trunk/src/app/srs_app_gb28181_stack.hpp
@@ -26,8 +26,6 @@
 
 #include <srs_core.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <string>
 #include <sstream>
 #include <vector>
@@ -185,5 +183,3 @@ public:
 
 #endif
 
-#endif
-
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index c649f76bb..d24cb1b84 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -98,13 +98,10 @@
     } \
     (void)0
 
-// For librtmp, it is pure c++ and supports all OS.
-#ifndef SRS_EXPORT_LIBRTMP
-    // Checking for st(state-threads), only support the following cpus: i386/amd64/x86_64/arm
-    // @reamrk To patch ST for arm, read https://github.com/ossrs/state-threads/issues/1
-    #if !defined(__amd64__) && !defined(__x86_64__) && !defined(__i386__) && !defined(__arm__) && !defined(__aarch64__)
-        #error "only support i386/amd64/x86_64/arm cpu"
-    #endif
+// Checking for st(state-threads), only support the following cpus: i386/amd64/x86_64/arm
+// @reamrk To patch ST for arm, read https://github.com/ossrs/state-threads/issues/1
+#if !defined(__amd64__) && !defined(__x86_64__) && !defined(__i386__) && !defined(__arm__) && !defined(__aarch64__)
+    #error "only support i386/amd64/x86_64/arm cpu"
 #endif
 
 // Error predefined for all modules.
diff --git a/trunk/src/kernel/srs_kernel_aac.cpp b/trunk/src/kernel/srs_kernel_aac.cpp
index 89d28a2b1..47749c5f0 100644
--- a/trunk/src/kernel/srs_kernel_aac.cpp
+++ b/trunk/src/kernel/srs_kernel_aac.cpp
@@ -23,8 +23,6 @@
 
 #include <srs_kernel_aac.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 // for srs-librtmp, @see https://github.com/ossrs/srs/issues/213
 #ifndef _WIN32
 #include <unistd.h>
@@ -202,5 +200,3 @@ srs_error_t SrsAacTransmuxer::write_audio(int64_t timestamp, char* data, int siz
     return err;
 }
 
-#endif
-
diff --git a/trunk/src/kernel/srs_kernel_aac.hpp b/trunk/src/kernel/srs_kernel_aac.hpp
index 5136b6210..14281827f 100644
--- a/trunk/src/kernel/srs_kernel_aac.hpp
+++ b/trunk/src/kernel/srs_kernel_aac.hpp
@@ -26,8 +26,6 @@
 
 #include <srs_core.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <string>
 
 #include <srs_kernel_codec.hpp>
@@ -61,5 +59,3 @@ public:
 
 #endif
 
-#endif
-
diff --git a/trunk/src/kernel/srs_kernel_mp3.cpp b/trunk/src/kernel/srs_kernel_mp3.cpp
index 6b7d9229d..df5c91788 100644
--- a/trunk/src/kernel/srs_kernel_mp3.cpp
+++ b/trunk/src/kernel/srs_kernel_mp3.cpp
@@ -23,8 +23,6 @@
 
 #include <srs_kernel_mp3.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 // for srs-librtmp, @see https://github.com/ossrs/srs/issues/213
 #ifndef _WIN32
 #include <unistd.h>
@@ -126,5 +124,3 @@ srs_error_t SrsMp3Transmuxer::write_audio(int64_t timestamp, char* data, int siz
     return err;
 }
 
-#endif
-
diff --git a/trunk/src/kernel/srs_kernel_mp3.hpp b/trunk/src/kernel/srs_kernel_mp3.hpp
index f2e9c6055..581fe38dc 100644
--- a/trunk/src/kernel/srs_kernel_mp3.hpp
+++ b/trunk/src/kernel/srs_kernel_mp3.hpp
@@ -26,8 +26,6 @@
 
 #include <srs_core.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <string>
 
 class SrsBuffer;
@@ -65,5 +63,3 @@ public:
 
 #endif
 
-#endif
-
diff --git a/trunk/src/kernel/srs_kernel_ts.cpp b/trunk/src/kernel/srs_kernel_ts.cpp
index 8bce1e9c4..0db82e797 100644
--- a/trunk/src/kernel/srs_kernel_ts.cpp
+++ b/trunk/src/kernel/srs_kernel_ts.cpp
@@ -23,8 +23,6 @@
 
 #include <srs_kernel_ts.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 // for srs-librtmp, @see https://github.com/ossrs/srs/issues/213
 #ifndef _WIN32
 #include <unistd.h>
@@ -3174,5 +3172,3 @@ srs_error_t SrsTsTransmuxer::flush_video()
     return err;
 }
 
-#endif
-
diff --git a/trunk/src/kernel/srs_kernel_ts.hpp b/trunk/src/kernel/srs_kernel_ts.hpp
index 303a5262b..14a77e422 100644
--- a/trunk/src/kernel/srs_kernel_ts.hpp
+++ b/trunk/src/kernel/srs_kernel_ts.hpp
@@ -26,8 +26,6 @@
 
 #include <srs_core.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <string>
 #include <map>
 #include <vector>
@@ -1350,5 +1348,3 @@ private:
 
 #endif
 
-#endif
-
diff --git a/trunk/src/protocol/srs_http_stack.cpp b/trunk/src/protocol/srs_http_stack.cpp
index 440a3de1f..acb196f70 100644
--- a/trunk/src/protocol/srs_http_stack.cpp
+++ b/trunk/src/protocol/srs_http_stack.cpp
@@ -23,8 +23,6 @@
 
 #include <srs_http_stack.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <stdlib.h>
 #include <sstream>
 #include <algorithm>
@@ -1346,9 +1344,6 @@ srs_error_t SrsHttpUri::path_unescape(std::string s, std::string& value)
   return unescapse(s, value, encodePathSegment);
 }
 
-// For #if !defined(SRS_EXPORT_LIBRTMP)
-#endif
-
 // LCOV_EXCL_START
 
 /////////////////////////////////////////////////////////////////////////////////////////
diff --git a/trunk/src/protocol/srs_http_stack.hpp b/trunk/src/protocol/srs_http_stack.hpp
index 736b81800..99a867b7a 100644
--- a/trunk/src/protocol/srs_http_stack.hpp
+++ b/trunk/src/protocol/srs_http_stack.hpp
@@ -28,8 +28,6 @@
 
 #include <srs_kernel_io.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <map>
 #include <string>
 #include <vector>
@@ -549,9 +547,6 @@ public:
     static srs_error_t path_unescape(std::string s, std::string& value);
 };
 
-// For #if !defined(SRS_EXPORT_LIBRTMP)
-#endif
-
 // For #ifndef SRS_PROTOCOL_HTTP_HPP
 #endif
 
diff --git a/trunk/src/protocol/srs_rtsp_stack.cpp b/trunk/src/protocol/srs_rtsp_stack.cpp
index 8755dcea9..618b2d456 100644
--- a/trunk/src/protocol/srs_rtsp_stack.cpp
+++ b/trunk/src/protocol/srs_rtsp_stack.cpp
@@ -23,8 +23,6 @@
 
 #include <srs_rtsp_stack.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <stdlib.h>
 #include <map>
 using namespace std;
@@ -1100,5 +1098,3 @@ srs_error_t SrsRtspStack::recv_token(std::string& token, SrsRtspTokenState& stat
     return err;
 }
 
-#endif
-
diff --git a/trunk/src/protocol/srs_rtsp_stack.hpp b/trunk/src/protocol/srs_rtsp_stack.hpp
index 0f8359f10..3b0da4538 100644
--- a/trunk/src/protocol/srs_rtsp_stack.hpp
+++ b/trunk/src/protocol/srs_rtsp_stack.hpp
@@ -26,8 +26,6 @@
 
 #include <srs_core.hpp>
 
-#if !defined(SRS_EXPORT_LIBRTMP)
-
 #include <string>
 #include <sstream>
 
@@ -578,5 +576,3 @@ private:
 
 #endif
 
-#endif
-