diff --git a/Formula/gawk.rb b/Formula/gawk.rb
index d33214c..2e30e3c 100644
--- a/Formula/gawk.rb
+++ b/Formula/gawk.rb
@@ -18,10 +18,6 @@ def install
     guest_prefix = "/home/linuxbrew/.linuxbrew"
     instrumented = buildpath/"gawk.instrumented"
     kandelo_wasm_build do |root|
-      # The SDK site owns target facts; these probes are specific to gnulib and gawk.
-      ENV["gl_cv_func_strerror_0_works"] = "yes"
-      ENV["ac_cv_func_GetSystemTimeAsFileTime"] = "no"
-
       system kandelo_configure, *kandelo_std_configure_args,
         "--disable-nls",
         "--disable-extensions",
diff --git a/Formula/grep.rb b/Formula/grep.rb
index 2e717bb..84b8f28 100644
--- a/Formula/grep.rb
+++ b/Formula/grep.rb
@@ -18,9 +18,6 @@ def install
     kandelo_require_arch!("wasm32")
 
     kandelo_wasm_build do
-      # The SDK site owns target facts; this gnulib runtime probe is package-specific.
-      ENV["gl_cv_func_strerror_0_works"] = "yes"
-
       system kandelo_configure, *kandelo_std_configure_args,
         "--disable-nls",
         "--disable-perl-regexp",
diff --git a/Formula/gzip.rb b/Formula/gzip.rb
index 0df8466..098a491 100644
--- a/Formula/gzip.rb
+++ b/Formula/gzip.rb
@@ -23,8 +23,6 @@ def install
       # from argv[0], matching Kandelo's executable-alias rootfs contract.
       ENV.append "CPPFLAGS", "-DGNU_STANDARD=0"
 
-      ENV["gl_cv_func_strerror_0_works"] = "yes"
-
       system kandelo_configure, *kandelo_std_configure_args, "--disable-nls"
       system "make"
       kandelo_validate_wasm_artifact(buildpath/"gzip", fork: :forbidden)
diff --git a/Formula/libpng.rb b/Formula/libpng.rb
index ae4d2ab..1f76301 100644
--- a/Formula/libpng.rb
+++ b/Formula/libpng.rb
@@ -20,7 +20,6 @@ def install
     kandelo_wasm_build do
       ENV["CPPFLAGS"] = "-I#{zlib}/include"
       ENV["LDFLAGS"] = "-L#{zlib}/lib"
-      ENV["ac_cv_func_feenableexcept"] = "no"
 
       system kandelo_configure, *kandelo_std_configure_args,
         "--enable-static",
diff --git a/Formula/m4.rb b/Formula/m4.rb
index a25c4c3..2b97880 100644
--- a/Formula/m4.rb
+++ b/Formula/m4.rb
@@ -24,9 +24,6 @@ def install
     kandelo_require_arch!("wasm32")
 
     kandelo_wasm_build do
-      # The SDK site owns target facts; this gnulib runtime probe is package-specific.
-      ENV["gl_cv_func_strerror_0_works"] = "yes"
-
       system kandelo_configure, *kandelo_std_configure_args,
         "--disable-nls",
         "--disable-dependency-tracking",
diff --git a/Formula/make.rb b/Formula/make.rb
index 728a3ef..2c11f79 100644
--- a/Formula/make.rb
+++ b/Formula/make.rb
@@ -19,8 +19,7 @@ def install
     kandelo_require_arch!("wasm32")
 
     kandelo_wasm_build do
-      # These runtime probes are package-specific; target facts stay in the SDK site file.
-      ENV["gl_cv_func_strerror_0_works"] = "yes"
+      # This package-specific runtime probe cannot run while cross-compiling.
       ENV["make_cv_synchronous_posix_spawn"] = "yes"
 
       system kandelo_configure, *kandelo_std_configure_args,
diff --git a/Formula/nano.rb b/Formula/nano.rb
index 37746f8..54b8114 100644
--- a/Formula/nano.rb
+++ b/Formula/nano.rb
@@ -24,11 +24,6 @@ def install
       ENV["NCURSESW_CFLAGS"] = "-I#{ncurses}/include"
       ENV["NCURSESW_LIBS"] = "-L#{ncurses}/lib -lncursesw -ltinfow"
 
-      # The SDK site owns target facts; these are gnulib probes that cannot run
-      # while cross-compiling.
-      ENV["gl_cv_func_strerror_0_works"] = "yes"
-      ENV["gl_cv_func_working_getdelim"] = "yes"
-
       system kandelo_configure, *kandelo_std_configure_args,
         "--sysconfdir=#{guest_prefix}/etc",
         "--disable-nls",
diff --git a/Formula/sed.rb b/Formula/sed.rb
index db5a64d..52389dd 100644
--- a/Formula/sed.rb
+++ b/Formula/sed.rb
@@ -19,8 +19,6 @@ def install
     kandelo_require_arch!("wasm32")
 
     kandelo_wasm_build do
-      ENV["gl_cv_func_strerror_0_works"] = "yes"
-
       system kandelo_configure, *kandelo_std_configure_args, "--disable-nls"
       system "make"
       kandelo_validate_wasm_artifact(buildpath/"sed/sed", fork: :forbidden)
diff --git a/Formula/xz.rb b/Formula/xz.rb
index 0210cd4..228c32e 100644
--- a/Formula/xz.rb
+++ b/Formula/xz.rb
@@ -24,17 +24,6 @@ def install
 
     kandelo_wasm_build do
       ENV["CFLAGS"] = "-O2 -fPIC"
-      ENV["ac_cv_func_closedir_void"] = "no"
-      ENV["ac_cv_func_malloc_0_nonnull"] = "yes"
-      ENV["ac_cv_func_realloc_0_nonnull"] = "yes"
-      ENV["ac_cv_func_calloc_0_nonnull"] = "yes"
-      ENV["ac_cv_header_sys_capsicum_h"] = "no"
-      ENV["ac_cv_func_cap_rights_limit"] = "no"
-      ENV["ac_cv_sizeof_long"] = "4"
-      ENV["ac_cv_sizeof_long_long"] = "8"
-      ENV["ac_cv_sizeof_unsigned_long"] = "4"
-      ENV["ac_cv_sizeof_int"] = "4"
-      ENV["ac_cv_sizeof_size_t"] = "4"
 
       system kandelo_configure, *kandelo_std_configure_args,
         "--disable-nls",